>>>>> 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.
On Thursday, October 8th, 2026 at 7:19 AM, Andrew C Aitchison
<[email protected]> wrote:
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 ?
On 08.10.26 17:34, ndrs via mailop wrote:
DKIM marked for the original domain (not GMX), from header for the original
domain, envelope sender for gmx.net
So SPF passed. I assume, without modifications to headers DKIM passed too
and was aligned with From:, satisfying DMARC as well. GMX did everything
for their customer to deliver and for you to be able filter mail properly.
I guess this is becoming more common. If a mail service can't block outgoing
susicious mail (forwarded or not), it uses separate outgoing mail server.
This way, they send the mail, but don't risk their primary outgoing server
being marked as a spam source.
Just filter such mail standard way, the secondary outgoing mail server
should result into higher spam score.
It's probably bulk mail sent to GMX customers, not a way to abuse GMX to
send spam.
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