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To Test POP3

telnet xxx.xxx.xxx.xxx 110 (xxx = mailserver)
+OK Hello there.
user USERNAME
+OK Password required.
pass PASSWORD
+OK logged in.
stat
+OK (Information about your mail)
quit
+OK Bye-bye.

To Test IMAP

telnet xxx.xxx.xxx.xxx 143
* OK (welcome message)
a login USERNAME PASSWORD
a OK login Ok.
a examine inbox
(Information about mail)
a logout
a OK LOGOUT completed

To Test POP3 over SSL

openssl s_client -connect xxx.xxx.xxx.xxx:995
Commands as above

To Test IMAP over SSL

openssl s_client -connect xxx.xxx.xxx.xxx:993
Commands as above