[Dovecot] pigeonhole openssl s_client

Hi!

I'm trying to get information about a server certificate from a pigeonhole sieve server. Various connection attempts show only "wrong version number" or "unknown protocol" errors from openssl:

$ openssl s_client -connect example.com:4190 { -tls1, -tls1_1, -tls1_2 } [ -starttls { imap, pop3 } ]

None of these work. I'm trying to see who signed the server cert. How could I do this?

Thanks, Daniel

-- LÉVAI Dániel PGP key ID = 0x83B63A8F Key fingerprint = DBEC C66B A47A DFA2 792D 650C C69B BE4C 83B6 3A8F