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$ openssl s_client -connect smtp.gmail.com:587 CONNECTED(00000003) 40C7ECECD27F0000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:354: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 5 bytes and written 316 bytes Verification: OK --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE No ALPN negotiated Early data was not sent Verify return code: 0 (ok) ---
$ openssl s_client -connect pop.gmail.com:587 -showcerts CONNECTED(00000003) 40576004DB7F0000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../ssl/record/ssl3_record.c:354: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 5 bytes and written 315 bytes Verification: OK --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE No ALPN negotiated Early data was not sent Verify return code: 0 (ok) ---