Testing POP3 over SSL/TLS
Here I'm putting the necessary commands to connect to a POP3 server over SSL or TLS in both modes - pure SSL and STARTTLS. It's convenient sometimes for debugging to connect to a POP3 server on the command line to see what's going wrong. But it's not good to use an insecure connection or maybe you want to test exactly a secure connection.
So instead of telnet, here you use:
There you get the same prompt a telnet connection to plain 110 port would give you but running over a secure connection. BTW same technique can be used as well for SMTP, IMAP, HTTP or other connection you're testing on the command line. Nice and easy, no?
So instead of telnet, here you use:
openssl s_client -host pop.example.com -port 995For the STARTTLS variant:
openssl s_client -starttls pop3 -host pop.example.com -port 110
There you get the same prompt a telnet connection to plain 110 port would give you but running over a secure connection. BTW same technique can be used as well for SMTP, IMAP, HTTP or other connection you're testing on the command line. Nice and easy, no?
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