How to test your mail server – imap, imaps, pop3, pop3s, smtp, smtps – using telnet

 

 telnet mx.example.com smtp
 telnet mx.example.com smtps
 telnet mx.example.com imap
 telnet mx.example.com imaps
 telnet mx.example.com pop3
 telnet mx.example.com pop3s

You should see the following message when testing a server.

telnet:Connected to mx.example.com.

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