"Yesterday Juliet Kemp showed us how to perform basic server
tests with telnet. Today Carla Schroder shows how to test
TLS/SSL-enabled POP3 and IMAP servers.
"This is a followup to Juliet Kemp's excellent Troubleshooting
Linux Servers with telnet article. This is adapted from my aging
but still-excellent Linux Cookbook.
"Testing POP3 TLS/SSL
"Telnet does not support any encryption. If you are protecting
your POP3 sessions with TLS/SSL then you need s_client, which is
part of OpenSSL. You can query both local and remote mail servers,
using your own server names of course. Commands that you type are