[exim] remote MX does not support STARTTLS

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Author: Christian Eyrich
Date:  
To: exim-users
New-Topics: [exim] GMX is %*^@ [Was: remote MX does not support STARTTLS]
Subject: [exim] remote MX does not support STARTTLS
Hi,

a few weeks ago the GMX mail servers stopped sending mails to my server.

The GMX mailer daemon writes:
     A message that you sent could not be delivered to one or more of
     its recipients. This is a permanent error. The following address(es)
     failed:
     christian@???:
     remote MX does not support STARTTLS


Thing is that my mail server does support STARTTLS and also advertises
this which I verify in the Exim debug log and was also record with tshark:

     20 212.227.15.19 → 94.16.119.13 SMTP 85 C: EHLO mout.gmx.net
     21 94.16.119.13 → 212.227.15.19 SMTP 224 S: 
250-mail.eyrich-net.org: Hello mout.gmx.net [212.227.15.19] | 250-SIZE 
52428800 | 250-8BITMIME | 250-PIPELINING | 250-CHUNKING | 250-STARTTLS | 
250-PRDR | 250 HELP
     22 212.227.15.19 → 94.16.119.13 TCP 66 41705 → 25 [FIN, ACK] Seq=20 
Ack=228 Win=64128 Len=0 TSval=3976249530 TSecr=307582370
     23 94.16.119.13 → 212.227.15.19 SMTP 114 S: 421 
mail.eyrich-net.org: lost input connection


Has something like that happened to you in the past or can you reproduce
it on my server?

BTW: Yes, mails from other systems arrive without problems. So that
looks like a general GMX error to me. But GMX is a quite large provider
here in Germany and the problem persists since begin of September
now—shouldn’t somebody have noticed that?
Since I also wasn't able to contact the GMX postmaster I’m asking you
for ideas.

Regards,
Christian