➜ ~ openssl s_client -connect imap.strato.de:993 -tls1_2
CONNECTED(00000005)
depth=2 C = DE, O = T-Systems Enterprise Services GmbH, OU = T-Systems Trust Center, CN = T-TeleSec GlobalRoot Class 2
verify return:1
depth=1 C = DE, O = T-Systems International GmbH, OU = T-Systems Trust Center, ST = Nordrhein Westfalen, postalCode = 57250, L = Netphen, street = Untere Industriestr. 20, CN = TeleSec ServerPass Class 2 CA
verify return:1
depth=0 C = DE, O = Strato AG, OU = Rechenzentrum, ST = Berlin, L = Berlin, CN = imap.strato.de
verify return:1
---
Certificate chain
0 s:/C=DE/O=Strato AG/OU=Rechenzentrum/ST=Berlin/L=Berlin/CN=imap.strato.de
i:/C=DE/O=T-Systems International GmbH/OU=T-Systems Trust Center/ST=Nordrhein Westfalen/postalCode=57250/L=Netphen/street=Untere Industriestr. 20/CN=TeleSec ServerPass Class 2 CA
1 s:/C=DE/O=T-Systems International GmbH/OU=T-Systems Trust Center/ST=Nordrhein Westfalen/postalCode=57250/L=Netphen/street=Untere Industriestr. 20/CN=TeleSec ServerPass Class 2 CA
i:/C=DE/O=T-Systems Enterprise Services GmbH/OU=T-Systems Trust Center/CN=T-TeleSec GlobalRoot Class 2
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/C=DE/O=Strato AG/OU=Rechenzentrum/ST=Berlin/L=Berlin/CN=imap.strato.de
issuer=/C=DE/O=T-Systems International GmbH/OU=T-Systems Trust Center/ST=Nordrhein Westfalen/postalCode=57250/L=Netphen/street=Untere Industriestr. 20/CN=TeleSec ServerPass Class 2 CA
---
No client certificate CA names sent
Server Temp Key: ECDH, X25519, 253 bits
---
SSL handshake has read 4174 bytes and written 289 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:
Session-ID-ctx:
Master-Key: 61B8978E9295FFAB49AAE2FCD0B2F4B7436204B951F01C25D5EE1BCCA93F455A230063DAA3C7B1D9688DB5A53C57074F
Start Time: 1622033445
Timeout : 7200 (sec)
Verify return code: 0 (ok)
---
* OK [CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=LOGIN AUTH=CRAM-MD5 AUTH=DIGEST-MD5 CHILDREN ENABLE I18NLEVEL=2 ID IDLE MOVE MULTIAPPEND NAMESPACE QUOTA SORT STATUS=SIZE UIDPLUS UNSELECT WITHIN XLIST] IMAP server ready (P18 TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384)