$ openssl s_client -connect smtp.gmail.com:465
CONNECTED(00000003)
depth=2 OU = GlobalSign Root CA - R2, O = GlobalSign, CN = GlobalSign
verify return:1
depth=1 C = US, O = Google Trust Services, CN = Google Internet Authority G3
verify return:1
depth=0 C = US, ST = California, L = Mountain View, O = Google LLC, CN = smtp.gmail.com
verify return:1
---
Certificate chain
0 s:/C=US/ST=California/L=Mountain View/O=Google LLC/CN=smtp.gmail.com
i:/C=US/O=Google Trust Services/CN=Google Internet Authority G3
1 s:/C=US/O=Google Trust Services/CN=Google Internet Authority G3
i:/OU=GlobalSign Root CA - R2/O=GlobalSign/CN=GlobalSign
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/C=US/ST=California/L=Mountain View/O=Google LLC/CN=smtp.gmail.com
issuer=/C=US/O=Google Trust Services/CN=Google Internet Authority G3
---
No client certificate CA names sent
Peer signing digest: SHA256
Server Temp Key: ECDH, P-256, 256 bits
---
SSL handshake has read 2994 bytes and written 434 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
Protocol : TLSv1.2
Cipher : ECDHE-RSA-AES128-GCM-SHA256
Session-ID: B3889FF0A30CF5AE07DD48861C8D15A8B1C85F1C3E4FBE2D66F17EE939F09BCA
Session-ID-ctx:
Master-Key: 471A9DB66A087471BB18A23B1EBC796027FFAC6CA8E5FC7CD7CF7667637BD3C6016360B8B71A131402C088AADEF79C38
Key-Arg : None
PSK identity: None
PSK identity hint: None
SRP username: None
TLS session ticket lifetime hint: 100800 (seconds)
TLS session ticket:
0000 - 00 29 08 43 4c 65 bf 15-a7 c9 51 d2 2f b7 da 58 .).CLe....Q./..X
0010 - 81 e9 67 78 9a ce 60 4c-e5 ac 3d 94 e9 1a 87 79 ..gx..`L..=....y
0020 - ac 77 6b a8 87 a7 9b cc-91 6f bf a8 29 89 c7 41 .wk......o..)..A
0030 - 11 2c 4a 52 0a 79 8c ca-5d 2c 30 2f a1 f8 8f 48 .,JR.y..],0/...H
0040 - 0b a0 f1 09 36 34 39 d6-8f 52 16 76 fd 5f 2c b5 ....649..R.v._,.
0050 - 89 26 bb 7a ef fc 01 3e-6c 74 61 c1 1f 02 3e 7d .&.z...>lta...>}
0060 - a1 04 72 22 79 a3 0a 22-dc 38 40 75 0a 78 3c db ..r"y.."[email protected]<.
0070 - 3e 09 23 9d 7a 24 e9 ab-2c 75 45 46 5e 1c aa ab >.#.z$..,uEF^...
0080 - 51 d9 0a 53 e4 e8 fd 2c-25 86 b5 cb 32 26 83 3b Q..S...,%...2&.;
0090 - 75 f4 53 4f d4 c2 f2 16-84 52 67 b9 ec 49 41 20 u.SO.....Rg..IA
00a0 - e4 89 01 36 65 db 02 49-de 77 ba 5b 7c 71 27 9a ...6e..I.w.[|q'.
00b0 - 99 58 c3 ca c0 90 1f 61-4c f5 e6 07 52 94 a6 bb .X.....aL...R...
00c0 - ea 4f ba 3e 5d ca df 20-1d dc 8d 5c 7e 4b 90 3a .O.>].. ...\~K.:
00d0 - ab e1 04 64 f5 ...d.
Start Time: 1555671882
Timeout : 300 (sec)
Verify return code: 0 (ok)
---
220 smtp.gmail.com ESMTP h12sm1678307wrw.36 - gsmtp
HELO [1.1.1.1]
250 smtp.gmail.com at your service
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Napomena: this_feature_currently_requires_accessing_site_using_safari