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Outlook cannot connect to your mail server ?

When setting up Outlook, or after ISP network changes, it is a common annoyance to be unable to send/receive email with a message of this type:

"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)."

Navigate to your email account settings in Outlook under: Tools > Account settings > highlight your account and click "change" > click "more settings"

Look through all the tabs. Make sure the outgoing/incoming mail servers, your username and password are correct.

Under "Outgoing Server", make sure you check: "My outgoing server (SMTP) requires authentication" and "Use same settings as my incoming mail server"

In the "Advanced" tab:
Select the correct type of encryption, and the correct ports for "Incoming server" (usually 110) and "Outgoing server (SMTP)" - 25 is the default outgoing port, however, many major ISPs block this port to reduce outgoing spam, so if you're not using your ISP for email, it may be blocked and that is probably the culprit. As an alternative, try port 2525, or one of the secure ports below.

Here is a list of the default standard mail ports for your reference:
SMTP - port 25
POP3 - port 110
IMAP - port 143
Secure SMTP (SSMTP) - port 465
Secure IMAP (IMAP4-SSL) - port 585
IMAP4 over SSL (IMAPS) - port 993
Secure POP3 (SSL-POP) - port 995

You can also try scanning the above ports to see which one is open on your mail server using our portscan, and/or you can also contact your ISP to verify whether they are blocking any mail ports, port 25 is the most common one being blocked.

  User Reviews/Comments:
by anonymous - 2014-04-17 00:49
Tks you very much! It's very helpful!
by Tien - 2014-09-03 10:47
Thank you very much
by anonymous - 2015-03-22 15:34
Sorted! I couldn't ask for more.
by anonymous - 2015-07-27 11:22
Super! In my case, I found out that my mail host use port 25 and 587. So by swapping to 587 in Outlook settings I managed to fixed the outgoing emails.
by Sabbir - 2015-09-16 01:54
by anonymous - 2015-09-23 15:21
Thank you so much that was a huge help!!!
by anonymous - 2015-12-08 15:37
perfect fix. Thank you for being a helpful netizen, much appreciation
by Vinit - 2016-01-08 04:15
I tried all the possible settings. Checked my internet speed also but still i'm receiving the incoming server error and continuously prompting a pop-up to re-enter the Login name and Password!
Thank you
by Sandra - 2016-01-29 21:37
Thank you so much for your help. I have been wrestling with this problem all day. I used 587 instead of 25...fixed the problem. Bless You!!
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