Last reviewed on August 2, 2015   —  15 Comments

One of the first questions I’m asked when I travel and someone finds out I support Microsoft Outlook, is:

How do I send mail from the hotel?

They can download their email just fine, but replies won’t send and they have no idea what’s wrong.

This is usually the result of authentication issues. In order to prevent strangers from using their SMTP server to send spam, many ISPs require users to authenticate when they try to send email while accessing the server from outside the network. In many cases, users will also need to use a different port number and may need to use SSL.

Check Outgoing Server Authentication

To check or change the outgoing server authentication, you need to open the Account settings dialog. In Outlook 2010 or Outlook 2013, this is on the File tab, and on the Tools menu in Outlook 2007 and earlier versions.

After opening the dialog to the list of email accounts, double click on the email account then click the More Settings dialog and select the Outgoing server tab to check the authentication settings.

Enable My outgoing server (SMTP) requires authentication and select Use the same settings as my incoming mail server. These settings will often work both at home and when traveling.

You’ll also want to check the port and SSL settings on the Advanced tab. Commonly used port numbers are 587, 465, and 1025 but if these don’t work, you’ll need to check your mail providers support pages for the correct port number. You may also need to select SSL or Auto for encrypted connections; again, this information should be on your mail providers support website.

Once you make these changes, you should be able to send email from home, coffee shops, or hotels.


  1. Maria Angelini says

    I have had this same problem for years, and am happy to say I have just implemented your recommended changes and it has worked.......thank you!!

  2. Zhenya Chausheva says

    Huge gratitude ! This problem always made me feel nervous during the holidays.
    It is now in the past :)

  3. David Williams says

    Great! My Outlook wouldn't work on wifi so had to use webmail (bit of a nuisance). Switched to "use same settings as incoming server" which enabled incoming mail to Outlook, then switched outgoing port from 25 to 587 which then enabled my outgoing mail!

  4. Rob Ellis says

    Okay for YEARS I've had trouble on one particular email account where I couldn't send emails out, however it was only on random networks so I was stumped! I just went in to settings and changed my outgoing port number to 587 and it works fine - I'm happy I'll never have to deal with this issue again. Thank you!

  5. Dueane Dill says

    PERFECT!!! This has always been a bother when travelling. Sometimes my outlook would work and sometimes it wouldn't - and I had no idea what was different.

    This simple setting change solved it!! Thank much!!!

  6. Tom says

    I travel on business and could never send emails through Outlook 2010. I was told by my ISP it was due to being in different time zones :-) Thank you for that Cox! Changed port from 25 to 587 and followed the other steps and it works great!! Thank you for the fantastic information. Maybe Cox Communications should hire you??

    • Diane Poremsky says

      I'm not sure I could work for a cable company, although I don't hear many bad things about cox, compared to Comcast. :)

  7. Tina says

    I have had this problem in the past and was frustrated with making port changes that didn't work the next time--I'm OK with a computer, but get frustrated, especially when I'm tired, in a strange place and just want to relax and answer business and personal emails. So, I now pay $40 a year to a server company that has taken care of that for me. I know for some people that sounds like a waste of money, but to me it's been a wonderful peace of mind for the last three years and I'll keep renewing as long as I'm traveling.

    • Diane PoremskyDiane Poremsky says

      Use the same basic idea - enable outgoing auth settings on your mail client. For the Outlook 2015 on mac, the settings are in Preferences > Accounts.

  8. Florian von Oppenheim says

    I'm using Windows 8, Outlook 2013 and had error 0800CCC80 in certain hotels in Japan when trying to send out emails from a Pop 3 account (with webmail server in USA). Changing the port and SSL settings on the Advanced tab to 587 fixed the issue. Thank you

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