Issues delivering mail from GMX to my postfix

Carsten Strotmann (sys4) cs at
Thu May 19 15:36:17 CEST 2016


I've got a report from a user that tries to send an mail from GMX to my
private mail account.

The mail-account is secured by DANE/TLSA and running on Postfix.
"" does not report any issues, but GMX refuses to deliver
mail with this message:

This message was created automatically by mail delivery software.

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)

cas at
remote MX does not support STARTTLS

Has anyone seen a similar issue? Any ideas how to troubleshoot?

Best regards


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