$ openssl s_client -crlf -ssl3 -connect imap.gmail.com:993
CONNECTED(00000003)
depth=2 C = US, O = GeoTrust Inc., CN = GeoTrust Global CA
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
 0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=imap.gmail.com
   i:/C=US/O=Google Inc/CN=Google Internet Authority G2
 1 s:/C=US/O=Google Inc/CN=Google Internet Authority G2
   i:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
 2 s:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
   i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=imap.gmail.com
issuer=/C=US/O=Google Inc/CN=Google Internet Authority G2
---
No client certificate CA names sent
---
SSL handshake has read 3578 bytes and written 284 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-RC4-SHA
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : SSLv3
    Cipher    : ECDHE-RSA-RC4-SHA
    Session-ID: A5043042F1825634B9222CB2FF4C40C94DBAD0C2FE47BE9E67B500DDEE69C206
    Session-ID-ctx: 
    Master-Key: 3615BE14D2D771380F5AEB4DBC30DF985609FD24D60AC32E1544A4EED96FFFACA614A5FD5516F5F1BA52E314F861095B
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1413453251
    Timeout   : 7200 (sec)
    Verify return code: 20 (unable to get local issuer certificate)
---
* OK Gimap ready for requests from 84.200.8.31 h13mb43071897lds