Last reviewed on April 27, 2015   —  148 Comments

When you are checking for new mail you might receive one of the following errors.

Tip: In many cases error codes are identical between Outlook and Outlook Express. If you search Bing for an error code and find a site which discusses Outlook Express, check it out. Because Outlook and Outlook Express both use the same underlying technology, the cause and the solution may be the same for Outlook.

Error Codes

#5.5.0 smtp;553 sorry, that domain isn’t in my list of allowed rcpthosts (#5.7.1)
This means the server you are trying to send to is blocking mail sent from your server. You’ll need to contact the recipient’s administrator or send your message using a different mail server.

553 5.7.1 Sender address rejected: not owned by user
This means you are not using the correct outgoing (SMTP) server authentication settings.
In Outlook 2007, go to Tools, Accounts Settings. In Outlook 2010 and 2013, go to File, Account Settings. Double click on the email account then click More Settings. Select Outgoing Server tab. Select Log on using and enter the username and password that can send using this SMTP server. Enable SPA only if your server supports it.

Mail server errors

Task – Sending reported error (0x80042109) : Outlook cannot connect to your outgoing (SMTP) e-mail server.
Check your outgoing server name, the port number and SSL setting, and the authentication setting. Open the Account Settings dialog, double click on the affected email account. Is the server name correct? Click the More Settings button. Check the authentication settings on the Outgoing server tab, and the port number and SSL settings on the Advanced tab.

Error 0x800CCC0F when sending or receiving email.
Usually caused by Antivirus software scanning email, but antispam scanners may cause Outlook to return this error as well. Disable the email scanning or increase the timeout setting. Also, make sure your firewall is allowing the scanner software to connect to the Internet.

Error 0x800CCC7D when sending email
This error code means you have SSL enabled and your mail server doesn’t support SSL. Disable SSL in Tools, Email Accounts, double click on the account, More Settings, Advanced tab. The error message may say that it’s a Secure Sockets Layer error.

Error 0x800CCC78 when sending
Verify the address you have entered in the From field is correct. Make sure there are no leading or ending spaces or other simple to overlook typos in your address. Verify sending authentication is correct in the Outgoing server tab of the More Settings dialog.

Error 0x80040119 when sending
“0x80040119” and “Unknown error” error messages when you try to read, send, receive, or delete e-mail in Outlook (814441) Disable the application accessing Outlook’s data and restart Outlook. You may need to reboot the computer before Outlook will send.

Error 0x80042108 when receiving messages.
There are a couple of causes for this error. You may have SSL enabled and don’t need it or you are running Norton Personal Firewall 2002 or Norton Internet Security software.

Error 0x8004010F when attempting to send and receive
This error is either the result of a corrupt delivery folder setting (POP3, message says Outlook data file cannot be accessed) or a missing or corrupt offline address book (Exchange server mailbox).

More Information

Discuss in our community


    • Shavon says

      Hi! I'm not getting an error message but I am having trouble. I finally got a green check mark by the log onto incoming mail server area but I keep getting an "enter your username and password" for the outgoing server so it can sent a test email. I can't get on without that and it's been popping up for almost an hour. Please help.

    • Diane PoremskyDiane Poremsky says

      click More Settings and then Outgoing server tab - try the option to use the incoming user/password.

  1. Diane Poremsky says

    This is with a gmail account? Did you enable the gmail account for POP3 access?

    What is the exact error message?

    • Nick Hanzopulos says

      HI Diane,
      This is a very old message and you may not be even doing this anymore, but I have a similar situation and I am using a gmail server with my company's domain name. i,e, Anyhow I get this message

      Task ""- sending reported error (0x8004010F): 'Outlook data file cannot be accessed'.

      I can recieve but not send. The messages are in my outbox but they go nowhere and when I press the send/recieve button it does nothing- no status bar appears as usual. It just started yesterday to do this without any new stuff going on with this account. My IT guys are not able to help. we went through all the advanced settings for the outgoing IMAP and outgoing SMPT, checked prts and security settings and no luck. Iknow they are right because I just configured a new phone using these same settings. I am totally stumped....can you help?


    • Diane PoremskyDiane Poremsky says

      This error> Task ""- sending reported error (0x8004010F): 'Outlook data file cannot be accessed'.
      means something is accessing the Outlook data file. It's not your smtp or port settings. Either a 3rd party utility is using the pst (sync utility, antivirus scanner, search utility, or something like lync) or the pst is corrupt and you need to use scanpst on it.

  2. iLucato says

    Regarding the error Error 0x800CCC0F it is driving me crazy! I did thousand tries and the issue remains. I have one computer where it works and other a new one, it was working and now it stopped. All account settings/ports are correct. Here are the tries with no positive results (didn't fix):

    1. Uninstalled M.Office 2010 and installed over;

    2. Removed Norton 360v5 and desactivated all Windows firewall;

    3. Removed the old Outlook profile and create a new one (From control panel) andset all accounts over;

    4. Tried another PST that is working in another machine with the same server account;

    What esle I would try?

    • Diane Poremsky says

      Uninstalling/ reinstalling rarely fixes problems. Norton security programs can cause problems, the plain vanilla Windows firewall generally won't (unless its set to block Outlook).

      Does the internet seem to work fine otherwise?

      What type of email account is configured in Outlook?

  3. how to set up outloo says

    i keep getting the error code 0x800ccc14 whenever i open my OE. what is this error and how can i get rid of it?this is linked to my gmail account

    • Diane Poremsky says

      What antivirus do you use? Is it scanning outbound email?

      Who is your email provider? Are you authenticating with the server?

      Some isp's won't allow you to send mail while using another isp's network - in many cases, changing the port to 1025, 587 or a port they specify will allow you to send.

  4. Lukasz b says

    Don't answer these idiots Diane, that's what happens when you blog you will get ppl trying to ask for a quick fix without doing so much as giving u an error code or searching for the error code. They should pay someone to give em the quick answer with a magic wand.

    • Diane Poremsky says

      When I'm really busy I do ignore some of the questions,. but they also help me to see where I need to update or improve my articles. :)

  5. Kevin Elliott says

    Your message did not reach some or all of the intended recipients.

    Subject: RE: Info for Carl Schultz

    Sent: 1/23/2012 11:13 AM

    The following recipient(s) cannot be reached:

    'carl schultz' on 1/23/2012 11:13 AM

    552 sid:R6Ci1i0063YFRl601:Message rejected for spam or virus content

    I get the above error on every 3rd or 4th try in my outlook sending. I try 2 or three times and it goes through. the recipient seems to get it each time? if i use web mail I have no issues at all so I am assuming it must be between outlook and our web host, they claim it is an outlook issue.

    Any ideas?

    • Diane Poremsky says

      What antivirus or security software do you have installed? Some will filter mail. If the problem is easily repro'd you can close outlook and restart in safe mode - To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok. - then see if it happens. If not, its caused by an addin installed by the security software.

  6. Janice Lee says

    My emails still stay in Outbox.
    I have tested account settings, and there was no error message.
    But, when I try to send an email, it doesn't leave the outbox.
    Please help!

    • Diane Poremsky says

      What type of email account? Are you authenticating with the Outgoing server? (Account Settings > double click on the Account > More Settings button > Outgoing server tab)

  7. MILTON says


    • Diane Poremsky says

      Who is your email provider? If you have web access to the account, try logging in online then try outlook again. And of course, make sure the password is correct in Outlook.

  8. Chris Stone says

    Hi I keep getting the following error message, which I have never had before after using this set up for a few years. the only difference is that I am using a new wireless connection to an australian ISPin a vacation rental home.

    Task ' - Sending' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).'

    I have tried rebooting my laptop, I have tried switching off my antivirus (Symantec endpoint Protection) and it has made no difference. Any help would be hugely appreciated.

    chris Stone

    • Diane Poremsky says

      What is your configuration for the outgoing server? Are you authenticating with the outgoing server?

  9. sam says

    I have configure three mail acc in outlook two mail accs are working perfectly but one email acc received mails but while sending its gives unknown error..Could any one help me please

    • Diane Poremsky says

      It's hard to say without an error code. Does it work in Safe mode? Did it ever work? Are the outgoing authentication settings correct?

  10. mgillham69 says

    Hi Diane, I am hoping you can help. We are operating on Windows 365 with our email through Outlook 2010. Everything works fine till around this time of day 4pm ish and for the last week we can't send or receive anything in the afternoons, mornings are fine. We are using two separate computers and getting the following error codes:

    Laptop computer
    Send 0x800CCC
    Receive 0x80042108
    Send 0x80042109

    Desktop computer
    Send 0x8004210B
    Receive 0x8004210A

    We have checked our account settings and everything is as it should be, we have contacted BT and our internet service provider and no one can provide a solution. We are struggling to run our business efficiently with constant loss of email in the afternoons? Can you help with any thoughts on what do to or where to go next to remedy this.

    Any help greatly appreciated.


    • Diane Poremsky says

      Does it happen if you use Safe mode? To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok.

      Does it work again if you reboot the computer?

      If you log into web access and send mail? That will help to rule out problems on the server side.

  11. mgillham69 says

    Hi Diane, thanks for your prompt help. I can answer two of your questions:

    It does not work if you re-boot on either the laptop or the PC. Both of us can use web mail but just not via Outlook.

    We are both in safe mode this morning, but won't know if that makes a difference until this afternoon when it crashes again, will come back to you on that later today, but have answered your other two points, not sure if this helps in getting us any nearer to a solution?

    Thanks again for your swift reply.

    • Diane Poremsky says

      If it works in Safe mode, it's an addin.

      To clarify - you are using Office 365 Exchange hosting? The error codes sound like typical SMTP errors, not hosted Exchange. If it is Exchange, do you happen to know which plan you are using?

  12. Michelle Cavanagh says

    Hi everything was going ok and now it's happening again to both of us and we are in SAFE mode. We are using our BT Webmail which has recently been upgraded to something called Office 365 and is compatible with our Outlook and we have checked all the settings with BT and everything is as it should be - but our business is now suffering because of this - not exchange I don't think ???? Can you offer any further advice?

    • Diane Poremsky says

      If they upgraded you to Office365, it should be Exchange server on the back end.

      What does the error message say?

      Which version of Outlook do you use? Go to Account Settings (File or Tools menu) and check the account type in the dialog. It will say to the right of the account name if its Exchange.

      If it says POP3 or IMAP, double click on the account name - what server names are you using? Click More Settings button and look on Advanced tab. What port # is it using?

  13. Lester says

    Hello, after Hotmail switched me over to Outlook I cannot send email from sbcglobal account that I was using with Outlook 2007. Please help.

    • Diane Poremsky says

      Do you get any error messages? What SMTP server dod you use with the sbcglobal account?

  14. Lester says

    I get the standard 0x80042109 message, I use It was working fine before Hotmail switched over to Outlook.

    • Diane Poremsky says

      Go into Tools, account settings, double click on the sbc account then More Settings. Look on the Advanced tab - what port # are you using? Try 465 or 587 and SSL or Auto. You also need to enable authentication on the outgoing server tab.

      Switching the hotmail server shouldn't affect it though.

  15. Lester says

    Hi Diane, I did exactly that, changed port to 465, SSL, and enabled authentication on outgoing server (option: use same settings as my incoming mail server), saved it and got this error message: The server you are connected to is using a security certificate that cannot be verified. The target principal name is incorrect.

    • Diane Poremsky says

      Did it have a continue using this certificate button? Yahoo uses wildcard certificates and outlook doesn't really care for them. Sometimes publishing it as a trusted cert works, but its not 100%.

  16. Lester says

    It did, but I was clicking 'no' since I did not know the impact. After reading your note I tested once more and clicked 'yes' and it worked! Great! Is there a way to get rid of this question?

    • Diane Poremsky says

      I have not found a fool proof waty ot get rid of it. I clicked view certificate then published it in the Trusted certificate store and it worked for a few days, now it back, as annoying as ever. :)

  17. Midas Commodity (@MidasCommodity) says

    hi Diane Poremsky
    i have been through your posts and replies and found it quite convincing.
    hope you could help me with my prob. with outlook too.

    i have outlook 2007 installed on my server 2003,
    i have a prob. related SMTP, when i send an email it shows as undeliverable from system administrator, though when i checked with my clients they are already getting mails i send from outlook...

    i have tried almost every thing i could but cant get this prob. solved out.

    would be thankful to you if get any solutions from your side...

    • Diane Poremsky says

      Are they getting the message and you are getting a bounce?
      What does the NDR message say say was the reason for the undeliverable?

  18. Midas Commodity (@MidasCommodity) says

    yes i have checkd with them they are gettin msg.

    but then i gt this rply in my outlook inbox (only in outlook inbox) saying :
    From : System Administrator
    Your message did not reach some or all of the intended recipients.

    Subject: *****
    Sent: (time & date)

    The following recipient(s) cannot be reached:

    '' on (time & date)

    None of your e-mail accounts could send to this recipient.

    • Diane Poremsky says

      What antivirus do you use? Do you get these NDRs if you use Safe mode?

      To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok.

  19. Midas Commodity (@MidasCommodity) says

    quick heal
    i even disable my antivirus but din worked

    though i tried it in safe mode today i din got anything in my outlook inbox yet

    but got conf. mail saying "delivered" in my gmail inbox -only for one recipient -which i get everyday

    but nothing for others

    • Diane Poremsky says

      So this is a gmail imap account? Are you saving sent items in the IMAP folders or in Outlook's local folders?

  20. Midas Commodity (@MidasCommodity) says

    well i dont particularly save items to any particular folder so it must b saved in Outlook's local folders

    also m quite new to outlook 2007

    so I've configured it as per the steps shown in gmail.i guess its POP3 acc.

    • Diane Poremsky says

      Check Tools, Account Settings- it will say what the account type is. Gmil recommends IMAP, and autoaccount setup usually chooses IMAP.

    • Diane Poremsky says

      It shouldn't matter. Are all messages affected or just some? Deleting the affected addresses from the autocomplete list may help.

  21. Rob says

    Hi Diane
    We have a problem in Outlook 2003 where the outgoing server (SMTP) port keeps getting changed from 465 (which we want) to 25 (presumably some sort of default). What might be changing this and is there anything we can do to stop it? We're using Security Essentials for security

    • Diane Poremsky says

      I'd look at antivirus first, although I know Microsoft Security Essentials isn't doing it. Is this a home computer or corporate network? If corporate, are you using a log on script?

  22. Rob Wallace says

    You advice for ver 14 does not work because MS changed the dashboard.

    How can I change the server settings in Mac

    Much appreciated -- thee is very little info on the net about this issue with this version.

    • Diane Poremsky says

      In Outlook 2011 for Mac, Accounts are under Tools menu, select the account and click Advanced button.

  23. Thomas says

    Hi Diane. I keep getting a error code of 0x800ccc0e.
    Im using outlook express 6 with live mail from hotmail.
    Ive tried various fixes with no results, i can recieve but cant send..!
    Please help...

    • Diane Poremsky says

      Does it include text with an error message? I know nee Hotmail has been having problems over the last few days, it may be related to that.

      What port # are you using? Try 487 or 465 and SSL or Auto.

  24. thomas says

    I have outlook express with Apple MACBOOK and all of a sudden get an error message when I try to delete emails that I have read or no longer need.
    The destination mailbox “(null)” does not allow messages to be moved to it.

    Thanks Thomas

    • Diane Poremsky says

      do you have a trash folder? In the menu > Mailbox > Use this mailbox for > Trash

      If that doesn't fix it, go to the > Preferences > Accounts.
      Choose your mail account that is having problems.
      Switch to the tab Mailbox Behavior.
      Disable the checkbox "Store deleted messages on the server".

  25. Bobby says

    Send test e-mail message: Your outgoing (SMTP) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider (ISP). The server responded: 554 Your access to this mail system has been rejected

    The above is coming back when I try to send. Please help.

    • Diane Poremsky says

      What type of email account? That error usually means you are not properly authenticating with the mail server. Who is your email provider?

  26. Sheleiumn Nightingale says

    Hi Diane!
    We have 40-50 users all using outlook. All in-house users are able to connect without errors using a simple outlook setup. However we have just hired a sales rep in France and she is having problems sending email through outlook. She is able to receive mail. Also,she is able to use the web app to both send and receive so it must be the setup of outlook. We have tried the default setup along with several iterations of SMTP ports (25,587,8025,465). No matter what port is used the same error occurs:

    The task "sending from" gave the error: 0x80042109
    Failed to send the message: outlook cannot connect to the Outgoing server (SMTP). If this message appears again, please contact server administrator or Internet access provider.

    Is there something additional that needs to happen because it is outside the US? Different ports?

    • Diane Poremsky says

      What type of email server do you use? What SMTP ports are open on the server? Is she authenticating with the server- in Account Settings, double click on the account then More Settings - look on the Outgoing Server tab.

  27. Isabelle says

    I also tried to link my outlook 365 to windows live mail essentiels. However I can only receive and not send. I get the error: 0x800ccc0e These are the steps I took:
    1. incoming mail: IMAP
    2. Server name:
    3. Port: 993
    4. Ticked the box: Encryption method: SSL
    5. outgoing mail: SMPT
    6. server name:
    7. port: 587
    4. Didn't tick the box Encryption method: SSL This because outlook gave the following ecryption method: TLSCould you explain me what I do wrong? Thank you!

  28. Amit Goyal says

    Hello mam... i have my yahoomail configured to outlook express 7 and suddenly since last 2 days i m unable to connect to the mail server and get the following error message:

    Receiving' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP). The server responded: -ERR Can not connect to e-mail server. Error:100502 '

    I tried to configure another mail at gmail server and found it was working, but when i try any new mail at yahoo mail server it shows the error that cannot connect to e-mail server.

    Please guide what should I do....

    Thanks a lot in advance


    • Diane Poremsky says

      Yahoo is having server problems - i *thought* it was fixed, but maybe only some accounts are working (my niece said her yahoo account was down for 40+ hours.)

    • Diane Poremsky says

      Can you log into the yahoo web interface? Are you using POP3 or IMAP in outlook?

      Yahoo had some problems earlier in the week, it's possible the problem is related to that.

  29. Ash says

    I too have been unable to work with Outlook since around 8th Dec "13 (over 240 hours now) with exact same error message as cited by Amit Goyal. He uses Express while I use Outlook - this is where the difference ends. I have a POP3 setup with Yahoo.
    Wonder if setting up a new profile would help at all, whether this is a workaround, whether we would need to return to the old profile if it worked.
    I rely on the outlook's capability of offline PSTs immensely.
    I am living by managing it online on YahooMail; with no offline archival in PSTs.

    • Diane Poremsky says

      I don't think a new profile will help. You could add the account to your profile as another account and see if that one works. If it does, verify the settings are identical - its possible yahoo changed their mail settings.

    • Ash says

      Thanks Diane for your kind note.
      You are right a new profile would have been no good.
      Perhaps your suggestion of adding the account to my profile as another account would have worked, if I had waited for your response.
      I happened to review It is dated 1st Nov "13.
      Accordingly I...
      a) changed Incoming Server from 110 to 995,
      b) changed Outgoing Server from 587 to 465,
      c) changed "Use the following type of encrypted connection" from None to SSL,
      d) Checked "This server requires an encrypted connection (SSL)".

      Surprise, it began working!
      e) why it worked all these years?
      f) why it stopped on 8th Dec "13?
      g) is it too much to expect a notification from Yahoo?
      h) how long the new set up would work?
      i) funny as it may sound...the amount of time I would suffer until I find remedy next time round

      Diane I tried the old set up, just in case. It does not work. But the error message is no longer what it used to be, it's different!

      I do not seek a response from you, it is just so that you know for the good of the community. Thanks much for your time Diane!

    • Diane Poremsky says

      Thanks for the update. If yahoo has an updated autodiscover file, adding it to the current profile as a new account would work, although so would a new profile (with a new account). I'm surprised yahoo didn't notify users the old settings were being retired.

      Yahoo has been updating their email system over the last couple of months. I'm not sure why it quit working on the 8th, although they had a huge failure not too long ago and many people were without mail for a day or two. It could be related.

      I believe the new settings will work for a long time.

      It looks like outgoing server port 465 is used with SSL, 587 is used with TLS - i'm using 587 and TLS and it works just fine.

  30. Tom Beiter says

    I use sbcglobal who use Yahoo's servers. We received a notice that the server names were changing ( and and the ports were changing to 995/465. I made all the changes, but have been having trouble regardless since. My Windows 8 desktop will pick up once if I delete and re-add the sbc account. Then it gets a message that it can't sync. If I delete and re-add again, I'll get the latest emails, but then that's it again. I've had issues with my android phone and Nexus device as well, but those finally started working. Not sure if it's just a matter of the operating systems getting the latest updates for creating the accounts through the wizard. Everything appears to be setup correctly in the account settings and if it works once on the initial create, I would think that would be enough. Any ideas?

    • Diane Poremsky says

      I don't think it's waiting for any type of update. Is the account set up as POP3 or IMAP? 995 is generally used for POP3, Port 993 is IMAP. The big difference is that POP3 downloads the mailbox, but IMAP syncs the folders.

      What is the exact error message?

      Is yahoo still hosting the mail or is AT&T bringing it back in-house?

  31. Bob says

    Hi. Early December, I had the same issue as a number of users above, and finally found out I had to change the port setting to 995. It worked fine until yesterday at midnight. Then again, outlook doesn't seem to be able to connect to yahoo mail again. (I know it changed at 0.00 because outlook downloaded a mail just a bit before, and could not access the server a bit after midnight, so it seems something changed when we went from Jan 3rd to Jan 4th). Any clue? And why isn't yahoo just giving these information about changes in a transparent way????

    • Diane Poremsky says

      No idea what happened, but i'll look into it. It could be a temp thing, i can't imagine they are changing it yet again.

  32. Peter Sullivan says

    Well thanks for the Outlook smtp error checking guidelines , I had the same issue, and finally found out I had to change the port setting can be helpful. I have also considering your demonstration too. Please update with some new error and solution.

  33. Wameed Abbas says

    Hello everyone, i have this error whenever I press the button send & receive mail messages it generates "" server isn't available. contact your administrator "", besides the status of my Outlook 2007 is disconnected. Yet every time i ping the Exchange server it replays perfectly no losses. I have this McAfee Antivirus 2008, it has never bugged me. Some computers send & receive and others get the same problem i explained above. I don't use internet connection, this company uses dead line connection with main branch.
    I tried different solutions, yet nothing worked.
    Could someone plz tell me what to do?

  34. Anthony says

    Thank you so much for your knowledge Diane. Error Number: 0x800CCC0F was driving me around the twist till I found your advice in pausing the anti-virus. Thank you

  35. Lance says

    Thought I'd share my experience recently but mind you we all have different configurations for use. I'm running a typical Windows 7 system and MS Office products and Eset Securities 7:

    Technical Issue: Outlook 2010 (Resolved) Port 993 unable to sync to incoming server on AT&T Network using iCloud or Gmail. Eset?

    All my emails in Outlook 2010 is unable to receive emails? Error: Unable to connect to incoming server in IMAP Configuration.

    After banging my head for hours yesterday on this topic and calling iCloud support, AT&T, ran ping/tracert tests, uninstalling/reinstalling it boiled down to a simple thing. If your running Eset Securities or any sort of firewall/anti-virus software check if your IMAP scanner is enable. Disabled it and re-test outlook.

    For Eset Security Users on your control panel:

    Setup>Enter advance setup>Web and Email>IMAP, IMAPS>Deselected (turned off) "Enable IMAP checking"

  36. MoRo says

    If you can't send mail, go into preferences, Outgoing Mail Server, use Port 587 - often the others are blocked. Then save and exit mail and then restart mail.

  37. margaret says

    Hi Dianne I started getting the error code 800 42109 Outlook cannot connect to you outgoing SMTP server. It is Outlook 2010 and when I log in it has a pop account. This happened suddenly. Do I need to add my email account again?

  38. Melissa says

    I recently installed a new modem from timewarner. My husbands Outlook (2003) worked sending and receiving, but two days later he got an error message for receiving email and continues to get the same message. "Cannot find server. Check your internet connection and server name". The internet was connected, the server addresses were was they are suppose to be for gmail. Alot of the blogs seem to talk about this same problem with little resolve. He an send, but not receive all of a sudden, but yet he can bring the computer to work or Starbuck, McDonalds and it sends/receives fine. So one tends to think it is the new router (at least he does) and Timewarner will take no responsibility. So I am looking for some other insight as he seldom works at home and needs to have this resolved.

    • Diane Poremsky says

      He can send but not receive? It's usually the other way around. Do you have problems browsing web sites? It almost sounds like a DNS problem but that should affect more than receiving email. If only outlook is affected, it's more likely a configuration issue than a bad modem. Make sure he is using the correct port # too.

  39. Muhammed yazir says

    hello i am using live mail. we have 22 users the problem is our mail sending error. when i configured mail settings that time it will work after 2 days its not working plz help mee..coming sendin error massege

    • Diane Poremsky says

      You are using Outlook configured with an account or you are using the Live Mail client? What is the exact error message?

  40. Rebecca Nored says

    Outlook 2010 able to receive but not send....HELO error 501 5.5.2 Command rejected invalid name. Thunderbird works fine. I have chkd server req chg.

    • Diane Poremsky says

      Invalid name indicates there is a typo somewhere - probably in the server name in the account settings.

    • Diane Poremsky says

      Yes, that would be one add-in that can cause problems with Outlook. In Outlook 2010, go to File, Options, Trust Center, Addins. What addins are enabled?

  41. Crown Guild says

    Hi Diane,

    Can you help me?

    this is the error message by outlook (2007)

    Task ' - Sending' reported error (0x80042109) : 'Outlook cannot connect to your outgoing (SMTP) e-mail server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'

    Thank you/

  42. margaret says

    Hi Dianne add-ins are:
    M/s Exchange
    Outlook Social Connector
    Outlook Share Point Server Colleague
    One-Note About Outlook Items
    Outlook Change Notifier

    • Diane Poremsky says

      Those are all Microsoft addins except for change notifier (that is Apple). If you aren't syncing with iTunes or iCloud, you can disable it, although it normally doesn't cause problems closing outlook.

      Did you test it in Safe mode and see if it closes ok? To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok.

  43. Margaret says

    Hi Dianne thanks again for your help. I sent a test email in safe mode. Still not working. Still saying contact system administrator etc.

    • Diane Poremsky says

      Did scanpst make a difference? Do you use Skype or Lync? They both access the data file but don't use addins.

  44. ellecid says

    Dianne, The support you are providing here is amazing and appreciated. Just wanted to mention that I kept getting Error Number: 0x800CCC0F trying to pop Yahoo mail to Outlook, until I created a sign in seal with yahoo, and set up an app specific password. Once I did this, Yahoo mail worked in Outlook 2013. Thanks for this posting and all the comments and responses, which helped me to finally figure this out.

  45. margaret says

    Hi Diane I have just now sent an email and it worked!
    Thank you so very much for your assistance and patience with me.

  46. Alan Bowser says

    Hi Diane. Thank you in advance for reading this! I'm using Outlook 2003. When I send an email to a, e.g., the message ends up in the "sent" folder as '' with the single apostrophe added. As far as I can tell, the mail is never sent. I have been able to send messages to individuals from outlook, but postings to the yahoo groups is a problem. I have check my settings with a comcast representative, and all are fine. It's the yahoogroups or outlook that is a problem. Have you encountered this in your work? Have a suggestion. I know I should to replace 2003, operating on Windows XP. Thanks for the consideration.

    • Diane Poremsky says

      It's not yahoogroups, I can send to those addresses. The ' shouldn't bee a problem either -if it causes the message to bounce, you'd get a bounce message.

      Oh, are you sending it from a Gmail address? Check in the yahoogroups web interface and see if it was received. Gmail won't display mail from you, so you won't see it unless someone replies.

  47. Walter McGrath says

    Why does Outlook have to "check with the server" before allowing me to do the most mundane things that have nothing to do with the server?

    • Diane Poremsky says

      What type of email account do you configured in outlook? Did you try setting outlook offline?

  48. geecoul says

    Hi Diane, PLEASE can you help me? Im trying to send messages from Outlook 2011 Mac from my laptop. For the last 5 days i keep receiving the error message '-17099 User has exceeded there send quota'. However, i can still send email from this account either from my iphone, or when i log in to the web based email hosted by godaddy.
    Any ideas as to what I can do to fix it?

    Many, many thanks!

    • Diane Poremsky says

      GoDaddy has a basic limit of 250 messages a day, and that alert seems to say you hit it... but it should apply to all devices. Log into your account at godaddy and check the SMTP relay allowance - the default is 250 but it is customizable and may have been lowered.

  49. Cecilia Fox says

    godaddy email. ATT DSL. outlook express or live mail on a different computer or android tablet mail - no outgoing on 1 of 2 email accounts. since March 2013. both set up exactly the same way w outgoing port 3535. have tried all the alternate ports. ATT DSL no help. I am so sure ATT is blocking. have read about unprovisioning and reprovisioning by ATT in other blogs. know anything about that?

    • Diane Poremsky says

      I don't think its att, since its not an tt account. i'd check the account settings and use port 465/ssl

      From my page on configuring godddy: The outgoing mail server can be either smtp.domain_name.tld or GoDaddy supports ports 25, 80, and 3535; or if you need SSL support, port 465. Make this change in More Settings > Advanced tab. GoDaddy does not always require authentication. Try it without authentication and if it fails, configure authentication on the Outgoing tab, choosing the option to authenticate with the incoming address and password.

      The steps will be different for non-Outlook clients, but the ports and setttings will be the same.

  50. Mark Goodall says

    Dear Diane

    I am going bonkers with a problem sending from Outlook 2002, I keep getting
    - Sending and Receiving' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).'

    I have just re-installed Windows XP Professional due to a disc error, so my machine is almost vanilla. I have no anti-virus software active or anything very much. My outlook was working perfectly before the disc error.

    I installed Outlook 2002 as part of Office professional.

    I have configured the email account as per

    which is the same as

    which I have done before.

    I have tried removing the tick on outgoing server authentication and there was still no joy.

    When I test the account settings everything works and it sends and receives a test email.

    But I just cannot send email using compose and "send", it simply sits in my outbox.

    I did reinstall Windows XP pro a year or so ago and recall that getting Outlook to send email was problematic but I managed to do it, but I am not having any luck this time.

  51. Muhammad Mudassar Umar says

    Solution of Outlook Error in MS Outlook 2007 and 2013

    "Send test e-mail message: Cannot send the message. Verify the e-mail address in your account properties. The server responded: 530 5.7.1 Authentication required"

    1- go to the outlook tools menu
    2- Account settings
    3- Double Click on email profile
    4- Go to more settings
    5- Outgoing server and click on "My outgoing server requires authentication"
    6- Click log on using
    7- Enter your full email address and password in respective field.
    8- check the field "remember the password " then click ok and complete the setup

    Note: "You can Configure your Yahoo ID"


    • Diane Poremsky says

      If they are getting sent but not received and they aren't bouncing back to you, the problem could be on the recipients side - their junk filter, mail server etc.

  52. ajoleary says

    Hi Diane, I have been using Outlook 2010 to download my Godaddy email (with my work domain) for a year and a half. I work at home and use Comcast as my ISP. It's been working fine the whole time and today suddenly I am unable to send any emails from that account. Nothing has changed. (I have 3 other accounts downloading to my Outlook, including one from the same work domain, and they are all working fine.) When I send an email from my main work account, it bounces immediately; sample email below. It doesn't say WHO the bounce email is from. Godaddy claims it's not on their end - I can use the account fine from the web interface. When I was on the phone with Godaddy support, I was able to send an email to them and it didn't bounce - that's the only one I've been able to send all afternoon (hmmmmmmmmmmm). Comcast says it's not them. I tried disabling Norton and it didn't make any difference. I tried running Outlook in Safe mode - didn't make a difference. My port is 465 with SSL (I tried every combination I could find but none of them would pass the testing). I have my email set to pop and my outgoing server is (Godaddy's server - it never did work with Comcast's outgoing server.) Help!!!

    "Your message did not reach some or all of the intended recipients.
    Subject: test9
    Sent: 11/7/2014 4:35 PM
    The following recipient(s) cannot be reached:

    on 11/7/2014 4:36 PM
    552 ClbZ1p0022aqc2F01 :: auth :: Message rejected for spam or virus content :: Please include this entire message when contacting support :: v=2.1 cv=XMC+SGRE c=1 sm=1 tr=0 p=4Wd1QkmEAAAA:8 a=yMe5U8mYZ1ZQPdExe5eung==:117 a=yMe5U8mYZ1ZQPdExe5eung==:17 a=TZb1taSUAAAA:8 a=DAwyPP_o2Byb1YXLmDAA:9 a=Zr7miEi8wWIA:10 a=cKsnjEOsciEA:10 a=SA5XvbQrKVaDPnDq4X0A:9 a=CjuIK1q_8ugA:10 a=yeqliAB5H2EA:10 a=yI1ukJ7LWKUA:10 a=EtrMh6MZNlsA:10 a=DClJQcuk1j4A:10 a=_dWNx--gS4MA:10 a=yMhMjlubAAAA:8 a=SSmOFEACAAAA:8 a=mD_sLXY8jm5j7n39TQwA:9 a=xAGaEkaPLX6GiohW:21 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=hTZeC7Yk6K0A:10 a=frz4AuCg-hUA:10 :: 100.00"

    • ajoleary says

      Yes, I am using a signature with phone #s. Now this morning I can't get it to bounce at all! If it does start bouncing again, I will try removing the signature and let you know. Thanks so much for your quick reply!

    • Diane Poremsky says

      Whatever filter was causing it was probably updated overnight. I'm not sure why some phone # cause problems in filters, but I've seen it happen several times. In the one case, I tested with the common phone number formats and with different numbers. Only the one phone # bounced and the format didn't matter. URLs can also cause problems.

      If it bounces again, try deleting the phone # from the signature.

  53. Barbara says

    Hi Diane
    Do you know if there is a way that 2 computers using the same email account can both do a send/receive at the same time without one getting an error message that "another user is using this is locked"? My parents use Outlook on both their computers, they have one email account. Outlook is set up as POP3 on both (IMAP wouldn't allow both to share, and we didn't like it). If my Dad is in his email, and my mom is in hers, she gets an error message when her Outlook goes to get new email and it won't come into her inbox, but it will go into my Dad's inbox no problem. I told her to wait until he gets out and try it, and it works fine. Is there a way that 2 computers can do an email send/receive at the same time into one account without one getting an error and getting locked out? She can send email when that happens, just not receive the emails that are there. All other times, everything works fine for both of them when they are on when the other isn't. Thank you.

    • Diane Poremsky says

      No, unfortunately, when you use pop3, a lock is put on the mailbox and there is no way to avoid it, short of using IMAP. Sorry.

  54. David says

    I can receive messages but outgoing messages get stuck in the Outbox. I get error: 0x800CCC78. Can you help, svp. David

  55. Supriya says

    Hey, i can receive the mails but can't send them. They remain in the outbox. Clicking send/receive doesn't help. Incoming and outgoing settings are all correct. If i try to send them using another account on outlook, they are seen in sent items but a mail from system administrator is seen in inbox stating that the mail was undeliverable to the intended recipients.

    I've tried to test the settings through sending a test mail. It works but the problem still persists. I am using Outlook 2007. Please help!!

    • Diane PoremskyDiane Poremsky says

      can you send messages in safe mode? To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok.

      Do you get any send and receive error messages?

  56. Supriya says

    Hi, I read the above post and your reply to it. Even I use signatures with Phone # and a url. I tried to remove them and send the mail again, but no use.

  57. Tony Monico says

    Diane - maybe you can help me....

    For about a month since around 2/10 or 2/11 when the feb Microsoft updates hit. Messages are getting stuck in my Outbox. They stack up until something finally times out or someone at the ISP (Comcast) notices and fixes something. I change nothing on my end and half the time I am asleep when this happens. The messages magically get sent. The errors used to be several ut now they seem solid and it is:
    "Send test e-mail message: The server responded: 421 resomta-ch2-11v.sys.c"
    This is happening specifically when I send a tets message in Outlook.

    Do you have any insight into what this means and how I can troubleshoot possible causes on my PC or do I need to push this back to the Comcast folks.

    Thanks in advance. This is very frustrating.

    • Diane PoremskyDiane Poremsky says

      I honestly doubt that Comcast notices anything and fixes it - that would be very rare indeed. :) If the error is due to overload, traffic is lower and they can send. Or whatever was blocking outlook is sleeping and it can connect.

      does it work better if you start Outlook in Safe mode? If so, a program on your end is blocking it - antivirus or iCloud would be my first guess. Both are known to cause issues.

      To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok.

  58. Mike says

    My outlook suddenly stopped contacting the server(s). I have four separate e-mails/domains - they can't all have failed can they? Likely to be an outlook problem rather than settings? Help!

    • Diane PoremskyDiane Poremsky says

      Or it's a computer problem. First, reboot - especially if you have updates waiting to be installed. Then try outlook in Safe mode.

      To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok.

  59. pinku saini says

    Task - Receiving' reported error (0x800CCC0F) : 'The connection to the server was interrupted. If this problem continues, contact your server administrator or Internet service provider (ISP).'

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