openssl s_client -starttls smtp -connect cs2107.spro.ink:25
CONNECTED(00000003)
depth=0 CN = 8089fe031125
verify error:num=18:self signed certificate
verify return:1
depth=0 CN = 8089fe031125
verify return:1
---
Certificate chain
 0 s:/CN=8089fe031125
   i:/CN=8089fe031125
---
Server certificate
-----BEGIN CERTIFICATE-----
MIICvjCCAaagAwIBAgIJAN/5/6bJTUd7MA0GCSqGSIb3DQEBCwUAMBcxFTATBgNV
BAMMDDgwODlmZTAzMTEyNTAeFw0xNzA5MDcxNjE0MDdaFw0yNzA5MDUxNjE0MDda
MBcxFTATBgNVBAMMDDgwODlmZTAzMTEyNTCCASIwDQYJKoZIhvcNAQEBBQADggEP
ADCCAQoCggEBAOudRQ4HzbfDbao8ZE57HOq/VICVE09tybB958GVZ1mcaqHxyz2r
B49pISz2mg9yVLvJTbQHAis/XHYHaILengHsmCsqXMYf1LLnU8vR/zzmzFwS0Dt2
Sbe0VeyeAKVoxQT1D2tqFhm9/feeXzxIqft/19/0KzQDKUzAl/VcQLKXErM6nfUr
W7FliFw0oSwsmZC7P+BkUMuZHTKukxRpFCVxU+iXlYac9dG6rNvKg3aHNUSegE1e
Gw4hEhlSiWcEGoVv3ZQMF9MqdMoaKxMgOIS8TO2mlk3hiUINpRj+Pj5QB1VA+dGt
ZdZXP3TUcPcSFXJZl5lCp6Z4O/cnj0BEAeUCAwEAAaMNMAswCQYDVR0TBAIwADAN
BgkqhkiG9w0BAQsFAAOCAQEAprpZtDQ/YWSBlCcRL3+kAQz1F0Hqqfa/9NRJf4QK
B89vudqkt2VRXnzX9v82ADQ2nXaEshrBXNuDOxtlBoUKjkVBhrPgkCfb7o3nk5CE
qUc3k89YI7RaEPhUNgP9lIiYD1rLtVUZK3Bpb+m6kysXVkXD4N0CfPbzJ6jKM5DG
IvTVUSz0AGPT6owC5kkRnICM6Z7jlbfwVeHYTr1kqIJvwH179jnYM2nQl1VydjKM
Ejz8Yp88BhG7P+w70yMi3uAymKMKyHlbGlrHqhBSUa3Madmjhcpgg+IsCPrh6ijs
k9HI1RDdp5VWMMGQ36dln53Assr6CrhJlfRwayDbJ57geA==
-----END CERTIFICATE-----
subject=/CN=8089fe031125
issuer=/CN=8089fe031125
---
No client certificate CA names sent
Peer signing digest: SHA512
Server Temp Key: ECDH, P-256, 256 bits
---
SSL handshake has read 1621 bytes and written 466 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-GCM-SHA384
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-AES256-GCM-SHA384
    Session-ID: F1E5F9D6D5AD7D7AAF9B02E94535E5F837B82FABD88BDD7E413D4AE26DBC3EF3
    Session-ID-ctx:
    Master-Key: 7D8C4423A3277EA9B4CFB9DBA0A6DDA51A774EDB6EE83B69CC65F1E597CB4673CEBF7693E95940814A34A4BFF1A6D0E2
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 7200 (seconds)
    TLS session ticket:
    0000 - cc c5 fb 82 5f 8e 3a be-90 12 e3 55 d5 b8 21 26   ...._.:....U..!&
    0010 - 9d 72 7d 10 d6 3a ed 58-95 cc 23 7f 54 2e 3f c8   .r}..:.X..#.T.?.
    0020 - 51 21 6a 4d 79 f2 26 62-c8 d5 04 ac aa 56 78 f3   Q!jMy.&b.....Vx.
    0030 - 0d 49 8a 20 78 dd ec d7-f1 61 3d b1 2a c2 29 6b   .I. x....a=.*.)k
    0040 - 16 18 2e 4a 7f 0a 41 a9-37 9f b0 76 e5 7e 85 c1   ...J..A.7..v.~..
    0050 - 8a 53 0e 1a 1a 90 5b 5c-62 ff 14 5f 3a 2b b4 cc   .S....[\b.._:+..
    0060 - 54 32 02 8a e7 81 e7 66-da e8 9b 7f b8 a6 8d 53   T2.....f.......S
    0070 - 53 2e 22 9f 3c a4 31 95-a1 bc ae 4d 1a bb b5 c9   S.".<.1....M....
    0080 - f3 9f 05 d4 dc 6b f3 fa-f1 cb cc 9a 43 39 1d c6   .....k......C9..
    0090 - df a4 13 fd fe 01 8c 83-c6 f2 d2 a0 29 0e 88 65   ............)..e

    Start Time: 1505799737
    Timeout   : 300 (sec)
    Verify return code: 18 (self signed certificate)
---
250 DSN