On 2017-02-09 03:24:09 (+0100), Andreas Ziegler <[email protected]> wrote:
> btw, does anyone know if the big providers take into account that some
> spam is only forwarded, not originating?  we have many customers who
> want to forward their mail from [email protected] to their
> gmail/hotmail/etc. mailboxes - which sometimes leads to problems if
> they receive many spam mails

Oooh... don't do that!

One of my users had a couple of catch-all domains (*@domain.example)
forwarding at their webmail account at a large provider.  After a couple
of dictionary spam runs, my mailserver's reputation was not so great
with that provider.

Definitely check for spam if you're forwarding.

Also note that DMARC breaks forwarding like this (or forwarding breaks
DMARC, depending on your religious affiliation).  You can get around SPF
as long as your envelope matches your relay but for DMARC, the From:
domain also needs to be aligned.

Philip

-- 
Philip Paeps
Senior Reality Engineer
Ministry of Information

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