How To Fix Your Port Settings If Cannot Send Mail From Outlook

Almost all mail client program send e-mail using port 25, which is also the port used by mail servers to talk to each other. But port 25 is widely abused by malware to spread worms and spam. As a result, many ISPs are restricting its use.

Hang on – it will make sense in a second:

Most people having a setup where they are on an Internet Service Provider (ISP) like ATT and have an email address like “MyEmail@ATT.net”  You connect to the internet using ATT and send mail through the ATT server – no problem.

But if you have your own domain email address or an email address from another ISP you may hit a snag. In these cases you are connecting to the internet through your ISP (like Comcast, SpeakEasy, ATT, etc) and trying to send email through your third party host like “MyEmail@SuperCoolWebsite.com”

Your ISP says “Hey! There is someone on my network trying to send email through someone elses address! This might be spam or malware!” You can receive mail, but you can’t send mail.

Recently ATT and Verizon both made changes that affected outgoing mail. Here’s the fix:

If you cannot SEND MAIL

  1. Open OUTLOOK
  2. Select TOOLS
  3. Select ACCOUNT SETTINGS
  4. Highlight the account in question and select CHANGE
  5. Select MORE SETTINGS
  6. Select ADVANCED
  7. Change from PORT 25 to PORT 587
  8. Save everything and restart Outlook

port-587

Other email programs will have similar settings. Look for PROPERTIES or PREFERENCES and find the outgoing mail server option.

One other option to check is that you are authenticating before sending. In other words. logging in with your username and password to both check and send email.

In Outlook the options window looks like this:

port-587-2

This tells Outlook to send your username and password before trying to send mail. If you have problems try enabling or disabling this setting.

The screen shots used in this how-to are my actual settings and they work just fine with SpeakEasy and ATT.

This entry was posted in eMail, Outlook, Troubleshooting and tagged , , , , , . Bookmark the permalink.

52 Responses to How To Fix Your Port Settings If Cannot Send Mail From Outlook

  1. JOHN_B1 says:

    Wow where did you get this info from. It works, but those people from ATT who aren't even in this country keep on telling me to use 465 which doesn't work. Thanks again.

  2. Betsy says:

    Thanks for the quick reference! I'd found a site with this information some time ago, but did not bookmark it. I appreciate the screenshot, and enjoyed your explanation of the issue! :)

  3. Iain Cox says:

    Many thanks for this post Daniel. It helped resolve an email problem that was causing me some frustration. Easy when you know how!

  4. ITworm says:

    Great post!!
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    Then I got a miracle solution which really worked for me.
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  5. raven says:

    Thanks a ton! ATT couldn't even figure it out.

  6. Josh Lucas says:

    Thanks a lot! Comcast was of no help a all (big surprise)

  7. erman says:

    Thanks so so much..

  8. Myra says:

    Thank you sooooooooooooooooooooooooo much ! It worked.

  9. MUSTAQUEEM HASHMI says:

    my outlook receave but not send mails
    incoming mail (pop3)is 202.138.97.97
    outgoing smtp is 202.138.96.26
    & this same settings work proper in other pc
    but not wirk in default pc………………

  10. Luz says:

    Great!!!! It works!!!! All I did was to change from Port 25 to 587. Thank you.

  11. vlad says:

    awesome! thanks

  12. So Happy says:

    Thank you very much! This worked for me with Qwest MSN email and I've spent hours trying to open port 25 on my new modem/router. Yaaaa!

  13. darwin says:

    good job!!!!!!!

  14. darwin says:

    i've been trying to figure out what to do you save me from alot of pain tnx alot!!!

  15. Dawn says:

    I was really getting frustrated. Thanks so much for a good quick fix!

  16. Erin Doom says:

    Port 587 doesn't work with Mac. I've tried 993, 465, 25 and now 587. Any suggestions?

  17. Lisa says:

    this was great, thank you! Worked perfectly!

  18. uggonsale says:

    Nice to be visiting your post again, it has been months for me. Well this article that I’ve been waited for so long. I need this article to complete my assignment in the college, and it has same topic with your article. Thanks, great share!

  19. I am very interested about it, will you share more detail? Like source of this story

  20. Thanks for your sharing, I like your article, looking forward to your next to share.

  21. leon says:

    thankyou very much, big pat on your back from me!!!! back to business!!!

  22. Jeff says:

    Awesome….The only question I have is, "when i leave the at&t network at my house, do I have to switch back to Port 25 at my office

  23. shan says:

    thx macha

  24. carkorma says:

    For all the people in the MAC world, the port that worked for me was 26.

  25. THANK YOU!!! I've been trying to figure this out for the past 2 months. Had to use my ATT email account to send messages. It was a pain going back and forth from Outlook to ATT, copying and pasting. Plus the emails would come out with different fonts, I wasn't able to insert pics into the body of the email…. ugh! Your settings helped so much. Feel free to use this as a testimonial for your services… Gabrielle Talley

  26. Dawn says:

    I am trying to set up on an android tablet with AT&T email and I am using
    username: myemail@att.net
    password: my password
    pop3 server: att.net
    port: 587
    and its not working….what am I doing wrong?

  27. Tamar Massie says:

    The screen shots used in this how-to are my actual settings and they work just fine with SpeakEasy and ATT.

  28. KathryneDun says:

    Almost all mail client program send e-mail using port 25, which is also the port

  29. OlivaOt says:

    Almost all mail client program send e-mail using port 25, which is also the port used by mail servers to talk to each other. But port 25 is widely abused by malware

  30. Dannielle says:

    You connect to the internet using ATT and send mail through the ATT server – no problem.

  31. As a result, many ISPs are restricting its use

  32. Julissa says:

    You connect to the internet using ATT and send mail through the ATT server – no problem.

  33. Zandra Earley says:

    You connect to the internet using ATT and send mail through the ATT server – no problem.

    http://www.escentual.com/a-derma/

  34. Waks says:

    Fantastic Fix! Many Many Thanks Daniel

  35. PHILnFINGERS says:

    I have a MAIL.COM email account that I cannot access on my phone with the constant error message "Unable to connect to server". I have tried the incoming server security of SSL (Accept all), with port No, 995, 993, 587, & also 26, but none of them are allowing me access.

    My outgoings server security is SSL (Accept all), with port No. 465, but again I have tried several other port numbers, but nothing I try is playing ball, so any help/assistance that you can provide will be gratefully appreciated please to use with the Android mobile phone email settings of my Mail.com account.

  36. amf says:

    YEAH! It worked, every other site had 465 or 25 or something else!

  37. l vicent says:

    Your feed back on Authenticating before sending works great ,not even my ISP (Comcast) Tech support was not able to correct the issue,they are using a Third party -Tech Support called Advance Tech Support if you ask for the Service you will be charge a one time feed of $55.00.your knowledge puts all of them to shame my Outlook is working fine after following your steps -thanks once again Curran JR

  38. Le dicen MAD. says:

    Worked for me. Excelent ! Thanks !

  39. Lil says:

    It worked for me but mails all bounced.

  40. Bob says:

    Best advice I received….worked like a charm

  41. Pierre-Yves says:

    Thank you so much Daniel, I had the problem for about a year. First I asked a specialist and that proved naive, then I searched the internet and for some reason did not find your post.
    And today after a year of sending mail only from home, and one full week of anger sending mail from my webmail instead of using Outlook, you solve my problem.

  42. danz says:

    bro you great it works perfectly thanks alot

  43. PaulaJ says:

    Thank You! Perfect!

  44. Pam says:

    This has been bugging me forever. THANK YOU!

  45. Kris says:

    I’d like to thank you for this reference, I actually work for a U.S AT&T department and lately we’ve seen this issue pop up more often. My first customer was frustrated and I used this to help come to a resolution and it worked like a charm. I’ve referred a few customers to this website just in case this problem comes up in the future and they’re so happy. A lot of us are using this so we don’t have to send customers to another department that charges a fee to help.

    Again, thanks a ton!

  46. Harry Houdini says:

    Dude you rock! I just fixed my Outook after wrestling with it for 3 days. Comcsst guys had zero idea how to help. Thank you! My only wonder is why this suddenly became a problem for me. Well, anyway, I am now happy.

  47. DLB says:

    Love, Love, Love you. So helpful. Comcast kept telling me to use 465.

  48. Attres Tagge says:

    Daniel,

    Unfortunately, this did not work for me. I am living in Bogota, Colombia and have ETB as my internet service provider; however, I use a cox.net email address. When I first arrived my port 25 worked from August 2013 – October 2013. I googled the issue and found a site that recommended port 465 and it worked up until last week I have tried all of the port numbers mentioned in this thread to no avail. HELP!!!!!!

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