On Thu, 8 Oct 2026, [email protected] wrote:

I got a spam from mout-xforward.gmx.net and was surprised that sending
IP was widely blacklisted including by Spamhaus. Is "mout-xforward" a
separate service that has a big outgoing spam problem?

mout-xforward.gmx.net is used, if the user has a forwarding enabled and
GMX has tagged the mail as SPAM.

Forwarding to the user?
So, only GMX users should get mail from mout-xforward.gmx.net?

No, forwarding from GMX users to external addresses.

External address belonging to a GMX user?
Else I don't understand what forwarding is talked about.

Whatever address (addresses?) the GMX user requested.

I don't see how a spammer could use it to send bulk email,
but some will come through the normal servers and thus have
a better reputation.

Were dkim and spf marked as from GMX or the original sender ?

--
Andrew C. Aitchison                      Kendal, UK
                   [email protected]
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