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Recipe 8.10 Testing an SSL Mail Connection
8.10.1 Problem
You
want to verify an SSL connection to a secure
POP or IMAP server.
8.10.2 Solution
For secure POP:
$ 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.
8.10.3 Discussion
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. [Recipe 4.4]
8.10.4 See Also
openssl(1).
