Change SMTP Port in MS Outlook

OutlookIf you can’t send email and you’re using a commercial ISP , they may be blocking SMTP port 25. This port is standard for sending email. But it’s also standard for sending spam, so ISPs often block it.

In order to send email again, you’ll have to change to a different port number. AVANetwork recommends use either Port 2525 or Port 587.

If you want to know more what exactly SMTP Ports is visit this link.

Here’s how to change the port number in Microsoft Outlook:


  • Load Microsoft Outlook 2010
  • Go to the ‘File’ tab
  • Go to the ‘Info’ section




  • Click on ‘Account Settings’
  • Click the drop-down button titled ‘Account Settings…’



  • Select your email account from the list.
  • Click the ‘Change…’ button




  • Click the ‘More Settings…’ button



  • Select the ‘Outgoing Server’ tab.
  • Tick ‘My outgoing server (SMTP) requires authentication’
  • Select ‘Log on using’
  • Enter the AuthSMTP username and password we supplied when you signed up
  • Tick the ‘Remember password’ option



  • Select the ‘Advanced’ tab.
  • Change the Outgoing Server field number (default number is 25. You can try 2525 or 587 by repeating these steps and change the number if this doesn’t work. You can also use 465 if you want to send messages using SMTP securely)

Note : if you use port No. 465, you must change ‘Use the following type of encrypted connection’ from None to SSL.


  • Click ‘OK’.


  • Click the ‘Next >’ buttonoutlook-2010-9
  • In the next window click ‘Finish’
  • In the ‘Account Settings’ window click ‘Close’
  • You should now be back to the main Outlook screen
  • Close Outlook and then reload
  • Check you are online then test to ensure you can send mail correctly

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