On Mon, Jun 10, 2019 at 05:51:42PM +0200, Arno Thuber via Exim-users wrote:
> The thing is, that it as far as I can see only happens when receiving
> messages from the German mail provider GMX.
The gmx.de MTAs support DANE in both directions. Does your MX host
have published DANE TLSA records? Are they correct? Is your
certificate still valid, or expired? ...
It would be helpful to post your email domainname and server hostname.
--
Viktor.
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