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My email client cannot connect to the Secure SMTP server and returns an error "Unable to connect to SMTP Server". What should I do?

Check the opened port number.

You can connect to the SMTP server and request the available port number using the TELNET protocol.

 

  • Click Start button
  • Select 'Run...'
  • Then type 'cmd' (no quotation marks) into the box and click 'OK'
  • You should see an MS-DOS Prompt window appear. Type in the following command:

    telnet smtp-server.com 25
    (25 - is a port number, any port number is available from the range 1-5000, except 53,137,139,443,445)
  • Click OK to connect to the SMTP server If the connection is successful, a response from the mail server will appear in the TELNET window: ESMTP READY! WELCOME TO smtp-server.com!

Telnet smtp-server.com

 

Note: If you are unable to request the opened port number, use port 80 which is an alternate one.

 

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