> > Note that this domain has bogus DNS records and mail will fail anyway.
> >
> > habitium.fr mail is handled by 10 _dc-mx.4063971290c7.habitium.fr.
> > # host _dc-mx.4063971290c7.habitium.fr
> > _dc-mx.4063971290c7.habitium.fr has address 212.63.111.139
> > Host _dc-mx.4063971290c7.habitium.fr not found: 3(NXDOMAIN)
btw I don't see anything _all_ that wrong with DNS, the underscore is not
really legit but lookup/connections do work
$ telnet _dc-mx.4063971290c7.habitium.fr 25
Trying 212.63.111.139...
Connected to _dc-mx.4063971290c7.habitium.fr.
Escape character is '^]'.
220 dns111139.phdns11.es ESMTP
quit
221 dns111139.phdns11.es
$ openssl s_client -starttls smtp -connect _dc-mx.4063971290c7.habitium.fr:25
CONNECTED(00000003)
depth=0 C = CH, L = Schaffhausen, O = Plesk, CN = Plesk, emailAddress =
i...@plesk.com
verify error:num=18:self signed certificate
verify return:1
---
Certificate chain
0 s:/C=CH/L=Schaffhausen/O=Plesk/CN=Plesk/emailAddress=i...@plesk.com
i:/C=CH/L=Schaffhausen/O=Plesk/CN=Plesk/emailAddress=i...@plesk.com
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/C=CH/L=Schaffhausen/O=Plesk/CN=Plesk/emailAddress=i...@plesk.com
issuer=/C=CH/L=Schaffhausen/O=Plesk/CN=Plesk/emailAddress=i...@plesk.com
---
No client certificate CA names sent
Server Temp Key: DH, 2048 bits
---
SSL handshake has read 2112 bytes and written 638 bytes
---
New, TLSv1/SSLv3, Cipher is DHE-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 : DHE-RSA-AES256-GCM-SHA384
Session-ID: A9039C3B3B4522F6283695BDA7BCAF1878E1E88305DFFEE4D6B4BF9BF0083927
Session-ID-ctx:
Master-Key:
5E0875DC3091ED77382AC3D4DA1A46389071CAB5653FBF0920227CEA39E959C1E483AA52541CA3BA3E7003503F47001C
TLS session ticket lifetime hint: 300 (seconds)
TLS session ticket:
0000 - 5c 36 78 96 f1 68 32 8a-93 01 ba 60 3f 52 25 1f \6x..h2....`?R%.
0010 - b9 de 9b 7e 5b 1b eb d8-3a 14 5e a2 82 05 86 b3 ...~[...:.^.....
0020 - 37 5f 7a 8b 39 bb 54 73-ce dc b2 c7 c6 68 9c db 7_z.9.Ts.....h..
0030 - 1a 1d 67 50 05 2a 75 9b-a8 c2 b3 65 9b 1b 81 cf ..gP.*u....e....
0040 - 86 63 cf 9a f7 4e df b5-e0 a9 6e 17 5a 37 11 cc .c...N....n.Z7..
0050 - 6d a0 9e df 77 5a 0f 98-fe 18 a2 ed be a2 8a 33 m...wZ.........3
0060 - 8e a2 69 cd 7c 1d 1e 9e-16 f5 e5 85 e7 c5 5f f4 ..i.|........._.
0070 - 46 35 f0 34 0e b0 66 c7-4e 4c fa db 6c f1 e2 0d F5.4..f.NL..l...
0080 - fc 32 74 c7 7e 0a d6 f8-44 ff 23 ba 7f 74 30 76 .2t.~...D.#..t0v
0090 - cd cc 68 f7 aa 13 6f a5-27 0a 78 0a 5e 06 9e f8 ..h...o.'.x.^...
Start Time: 1663844703
Timeout : 7200 (sec)
Verify return code: 18 (self signed certificate)
---
250 8BITMIME
Q
DONE
