Hi Dave, *,
/
I represent a platform that sends mail on behalf of our customers but we
maintain a separate 5321.From that points back to us.
We dual-sign messages using the client domain and our own domain, but these do
not align. We rely on DKIM alignment to pass a DMARC test.
Example:
5321.MailFrom: {encoded local mailto:part...@ourcompany.com
5322.FromHeader: mailto:r...@customer.com
DKIM 1: http://customer.com
DKIM 2: http://ourcompany.com
\
looks totally fine complying DMARC requirements, but wouldn't fit ours.
nevertheless these our requirement apply only to those IPs/IP pools, that we
see abuse from and get user complaints for.
As long as you/your customers do not address SPAMtraps or cause complaints,
your totally fine with your setup.
But If you do attract our attention that way, your IP(s) get blocked for maybe
one customer behaving irregularly.
You can get from your logs the number of SPAM reject or user unknown bounces
you incur with @t-online.de .
If there are, stop these or get aligned.
Florian
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