Testing an SSL Mail Connection

8 01 2013

$ openssl s_client -quiet -connect server:995
[messages about server certificate validation]
+OK POP3 server.net v2001.78rh server ready
Type QUIT to exit.
For secure IMAP:
$ openssl s_client -quiet -connect server:993
[messages about server certificate validation]
* OK [CAPABILITY ...] server.net IMAP4rev1 2001.315rh at Mon, 3 Mar 2003 20:01:43 -
0500 (EST)
Type 0 LOGOUT to exit.

If you omit the -quiet switch, openssl will print specifics about the SSL protocol negotiation, including the
server’s X.509 public-key certificate.
The openssl command can verify the server certificate only if that certificate, or one in its issuer chain, is listed in the system trusted certificate cache.

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