[Eisfair] Mailzugriff per imap nicht mehr möglich, TLS, Thunderbird 78

[Alex Busam]

  openssl s_client -connect dfc1.dyndns.org:143 -starttls imap
CONNECTED(00000003)
depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
verify return:1
depth=0 CN = ddd.ddddd.org
verify return:1
---
Certificate chain
  0 s:CN = ddd.ddddd.org
    i:C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
  1 s:C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
    i:O = Digital Signature Trust Co., CN = DST Root CA X3
---
Server certificate
-----BEGIN CERTIFICATE-----
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD==
-----END CERTIFICATE-----
subject=CN = ddd.ddddd.org

issuer=C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3

---
No client certificate CA names sent
Peer signing digest: MD5-SHA1
Peer signature type: RSA
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 3676 bytes and written 448 bytes
Verification: OK
---
New, TLSv1.0, Cipher is ECDHE-RSA-AES256-SHA
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
     Protocol  : TLSv1
     Cipher    : ECDHE-RSA-AES256-SHA
     Session-ID: 
3AA444EA335CF70210AD37136B62777053FEA25AF02D1BAFB8DA33BA2DC6ABD1
     Session-ID-ctx:
     Master-Key: 
ABE3A8540447B55A30CE0C3376D41FFF1508C7CC09CE1A40A704437C8CA322CCD1971D77AA85EC81E3E64358B016E093
     PSK identity: None
     PSK identity hint: None
     SRP username: None
     TLS session ticket lifetime hint: 7200 (seconds)
     TLS session ticket:
     0000 - 52 4e 24 5a e7 82 a1 88-f5 b4 33 7f e5 83 8f a3 
RN$Z......3.....
     0010 - 5d 0b 71 f6 ed 26 c0 ec-ec ed 08 04 3a a8 db ab 
].q..&......:...
     0020 - 46 7c f8 f6 c1 e8 56 96-17 c0 ec d0 eb 7b 3c 72 
F|....V......{<r
     0030 - 05 c4 3a 01 ef 2e 7b 8a-8b 19 aa f0 77 6c 02 75 
..:...{.....wl.u
     0040 - 92 6e d2 bd 73 47 df 70-9a cd 23 82 fe 40 22 c3 
.n..sG.p..#..@".
     0050 - 4d bf 54 0a 83 15 4d 5d-b0 82 08 51 39 89 4d 1e 
M.T...M]...Q9.M.
     0060 - 1f 84 4b 40 23 cc 51 18-fc 39 e3 39 ae 46 0e 2d 
..K@#.Q..9.9.F.-
     0070 - 44 a2 ae 6b d2 8c ed bc-bb 9c 93 7b b4 4b 67 3f 
D..k.......{.Kg?
     0080 - 9d e0 9d 49 6c 35 ec 54-a0 17 5d 75 e9 c8 00 4b 
...Il5.T..]u...K
     0090 - d9 a2 0f 68 ca 21 65 2d-14 ef e6 47 82 42 de 0a 
...h.!e-...G.B..

     Start Time: 1595325917
     Timeout   : 7200 (sec)
     Verify return code: 0 (ok)
     Extended master secret: yes
---
. OK CAPABILITY completed