There are several reasons why Microsoft Outlook won't send mail and before you can fix the problem, you need to identify the cause.
Windows 10 users who are having problems sending email after upgrading their computer, see Outlook Error Ox800CCC13 in Windows 10.
iCloud users, see "After Installing iCloud, Mail Won't Send?". You may need to change your SMTP server name.
Possibly the most common cause is the message is too large to send because you added a huge attachment to a message. If this is the problem, see Delete large messages from the Outbox if you can't delete the stuck message. Instructions for Outlook 2011 for Mac are at Delete Messages Stuck in Outlook 2011 Outbox.
If you are using iCloud and messages get stuck, see Outlook and iCloud 2: What you need to know for the latest information.
If you don't see a message in your outbox but Outlook is trying to send something, see Hidden Stuck Messages. It's most likely a read receipt that won't send.
If the message is not too large to send, other possible causes include:
- An add-in that marks items read if you view the Outbox
- Wrong password or not authenticating properly with the mail server
- Outlook or the mail server is offline
- No default email account is set
- Corrupt Send and Receive Settings
- Using a program that accesses pst or ost data, such as Desktop Search, Lync, etc
- An antispam or antivirus scanner is scanning outgoing mail
First, check the Send/Receive progress dialog for error codes. Browse to Tools, Send/Receive, Send/Receive settings, Show progress and click on the error tab. The error will resemble this, with a different error number and possibly a better explanation than "unknown error"
Task '<account> - Sending' reported error (0x80040119) : 'Unknown Error 0x80040119
See What does this error mean? for the reasons for some of the error codes. (If you need the text of the error code, you can select any error and use Ctrl+C to copy it.)
An add-in marks items read if you view the Outbox
Symptom: you look at the mail in the Outbox and it's not bolded.
Quick Fix: Stop looking in the Outbox.
See Outlook: After viewing the Outbox, e-mail won't send for applications that cause messages in the Outbox to be marked as read.
Wrong or bad password, or not authenticating properly with the mail server
Verify your password works by logging into your account using web access.
Check your account settings:
- Go to Tools menu (Outlook 2007) or File tab (Outlook 2010) then Account Settings, Email.
- Double click on the account then click More Settings.
- Check your settings on the Outgoing server tab. Many email providers now require a password to send email. If you aren't sure, enabling authentication before sending usually doesn't cause problems, but you should verify the proper settings with your email provider.
- Do not enable SPA unless your mail server requires it.
- Verify the port number is correct on the More Settings, Advanced tab. Many email providers use port 587 for SMTP.
In Outlook 2003 and older, go to Tools, E-mail accounts, View or Change existing accounts. Double click on the account and click More Settings, then select the Advanced tab.
Outlook or the mail server is offline
Is Outlook online? The online status is in the Status bar.
Is the mail server online? Outlook's status bar may say 'Trying to Connect' if the mail server is down.
No default email account is set
Symptoms include being able to reply but not send new mail.
This may happen when you use a preconfigured script provided by the mail server administrator to set up your account.
In Outlook 2010, go to File, Account Settings, Email. Is an set as default?
In Outlook 007, you'll check for a default account in Tools, Account Settings, Email. In Outlook 2003 and older, go to Tools, E-mail accounts, View or Change existing accounts. Verify an account is set as default.
The SRS file is corrupt
Outlook saves your Send and Receive customizations in a file with the extension *.SRS. If this file is corrupt, the Send & Receive Settings dialog won't open and you may receive send & receive errors. Find and delete or rename the SRS file for your profile.
In Windows 7, 8 and Vista the SRS file is at C:\Users\username\AppData\Roaming\Microsoft\Outlook\. In Windows XP, the SRS file is found at C:\Documents and Settings\%username%\Application Data\Microsoft\Outlook\. In either case, you can type or paste %appdata%\microsoft\outlook in the address bar of Windows Explorer, then press Enter, to jump to the folder.
Using a program that accesses the .pst or .ost data
Symptom: Mail sends at first, then hangs in mailbox
Send and Receive error code is: Task '<account> - Sending' reported error (0x80040119) : 'Unknown Error 0x80040119.
Use Scanpst to repair the pst file, or delete the ost file and let Outlook rebuild it. See Error message when you try to read or to delete email or when you click "Send/Receive" in Outlook: "An unknown error has occurred" or "Messaging interface has caused an unknown error" (MSKB) for more information.
Restarting Outlook (after verifying it closed completely in Task manager) may allow the mail to send.
Reboot and disable the problem program before starting Outlook.
If it continues to cause problems (such as sending works for awhile after restarting Outlook, then stops), uninstall the software.
An antispam or antivirus scanner is scanning outgoing mail
Norton and AVG antispam plugins are known to cause problems, but there are others. Any antivirus that uses an Outlook addin can cause issues with your email.
Solution: Disable Email scanning in the software.
It may help to the timeout (in your email account's More Settings, Advanced tab.) Otherwise, check your antispam or antivirus program's website for an update or possible workarounds. Note that we do not recommend scanning email for viruses as any virus will be picked up if you try to open an infected message (which you know not to do :)).
If none of the above are the cause and the account settings look okay, turn on SMTP logging.
To turn on logging in Outlook 2010, go to File, Options, Advanced. Enable Troubleshooting logging is near the bottom, in the Other section. I n Outlook 2007 and Outlook 2003, go to Tools, Options, Other, Advanced and add a check to the box beside Enable Logging (troubleshooting).
Because logging can cause Outlook to be unstable, initiate a send and receive and once you've reproduced the error, disable logging. The log files are stored in your temp folder. Type %temp% in the address bar of Windows Explorer and press Enter to open the Temp folder. The log files will have the extension .log and may be in an Outlook Logging subfolder.
How to enable transport logging in Outlook (MSKB)
Hidden Messages that won't Send
When you have a hidden message that won't send, it's a stuck read receipt. They are stored as hidden messages at the root level of your mailbox.
There are two methods that can be used to delete them:
1. Change the SMTP server for the account to a SMTP that can send the receipt. After the read receipt is sent, change the SMTP back to the one you normally use for the account after they are sent.
2. Delete the hidden messages using MFCMAPI or OutlookSpy. Because MFCMAPI does not need to be installed, it's our choice for most users. (We do not recommend using MDBVue as it is outdated and was replaced by MFCMAPI.)
We have complete instructions for deleting stuck read receipts using MFCMAPI at Delete Read Receipts using MFCMAPI.
When I initially left a comment I appear to have clicked on the -Notify
me when new comments are added- checkbox and from now on whenever a comment is added I receive 4 emails with
the exact same comment. Perhaps there is a way you can remove
me from that service? Kudos!
Were you subscribed under this address? I can't find a subscription for you for any page on my site.
Another suggestion. If your outlook is sync to your phone, empty and clean it too specially the sent folder with attachment.
Outlook 2016 connected to hosted Exchange from Rackspace. User says after computer is idle for a while, Outlook stops sending. It says it's connected to Microsoft Exchange and clicking another folder or forcing a send/receive makes Outlook hang. If he closes Outlook and reopens it, the message(s) send right away. I have rebuilt the OST file, changed the send receive settings to different amounts of time to send and receive and verified that he has good Internet connectivity when the problem occurs. Any other ideas?
That almost sounds like a NAT router issue.
changed the send receive settings to different amounts of time to send and receive
The send and receive settings dont apply to exchange accounts - outlook talks to the server on a schedule.
Hi Diane, I have MS Outlook 2010 and I use it with Gmail IMAP. Everything is great until January 9. The next day I could not send any emails from Outlook anymore. I have tried forcing a send with F9. I can send fine from my online account. I have checked all send and receive settings and followed a whole bunch of forums online to see what else I can do. I have 'repaired' Office 2010. I get no error messages. I have no email scanning enabled. Still, everything just sits there.
Does new mail download? That would eliminate a change in your gmail settings. Do you get any error messages?
We seem to be having similar issues adn our tech people, Microsoft, IPrimus (our NBN provider) and AusHosting (our domain name host) cannot seem to help us fix it.
Basically our domain name changed to AusHosting and we altered our e-mail account settings as instructed using IMAP port 993 for incoming mail using SSL encryption & Outgoing port SMTP 25 however outgoing ports 587 & 465 have also been tried.
We are able to recieve e-mails but cannot send and in the short term have had to change the outgoing mesage settings to that of our NBN provider IPrimus just to be able to send. Some of these are still coming back as undeliverable or rejected by the recipents too however.
IPrimus assure us that they are not blocing the ports and our tech couldn't solve this.
Does anyone know how to fix Office 2016 Outlook to allow us to send our outgoing e-mails via our domain address apart from logging into webmail and ditching outlook entirely?
Are you getting any send and receive error messages? Many isp's block or hijack port 25, so 587/TLS or 465/SSL is the best bet.
Inbound authentication failed with error LogonDenied for Receive connector Default BIOMAIL. The authentication mechanism is Login. The source IP address of the client who tried to authenticate to Microsoft Exchange is [192.168.1.100}
Kindly help how to remove this error.
Installed Outlook 2010 (from disc) on new computer (Windows 10) and have had nothing but trouble since.
Two accounts work fine, three don't.
All receiving OK, but sending stuck in Outbox.
Error messages are: Sending' reported error (0x8004010F) : 'Outlook data file cannot be accessed.'
Ran sfc /scannow - "no integrity errors found"
Moved Outlook data file from where it was put when I set up account to same folder as as successful data files are in.
Contacted HostGator to verify settings.
Are they pop accounts? If so.... In file, account settings, select an affected account and click change folder, select the appropriate inbox and click OK.
No, they are IMAP accounts.
I have 1 email address that I cannot send from. I receive the following error:
Task 'SMR - 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 deleted and recreated the email, I have turned on logging but nothing seems to work. I can forward the message from another account (same domain) and it goes through.
I have searched for the .srs file and cannot find it. I am using Windows 10, Office 2010. The problem just started 2 days ago.
Other things I have tried: turning antivirus/antispam software off, different messages from affected account.
Does it work 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. If it works ok, then one of the add ins or support files is the problem.