On Thu, Dec 18, 2025 at 08:59:39AM +0100, Ralf Hildebrandt wrote:
> > $ curl -sLo - https://mta-sts.charite.de/.well-known/mta-sts.txt; echo
> > version: STSv1
> > mode: enforce
> > mx: mail-cbf-ext.charite.de
> > mx: mail-cvk-ext.charite.de
> > max_age: 1209600
> >
> > The lines of that "mta-sts.txt" file are not quite conformant with
> > RFC8461, which specifies <CRLF> not <LF> line separators. And it might
> > be prudent to also use a <CRLF> terminator for the last line, even
> > though that's not strictly required.
>
> I think I fixed that now.
Yes, though perhaps as a matter of house-keeping (again not required)
drop the extra blank line at the end.
$ curl -sLo - https://mta-sts.charite.de/.well-known/mta-sts.txt | cat -etv
version: STSv1^M$
mode: enforce^M$
mx: mail-cbf-ext.charite.de^M$
mx: mail-cvk-ext.charite.de^M$
max_age: 1209600^M$
^M$
Do you have any choice of issuer CAs? With a different ECC root CA you
might find a more broadly accepted root, in case that's the issue for
mimecast.
--
Viktor. 🇺🇦 Слава Україні!
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