Wow at least you got a feedback, which is more than i got the last 3 years i have given up, my client know mail delivery to microsoft mailservice is not guaranted, and i recomend to convince mailpartner for a change to a more cooperative Mailprovider. if i´m able to route microsoft mail via relayhosts on IP-ranges/AS which are not blocked, but i wont spend much time anymore in timeconsuming workarrounds.
Roger
On 25/01/2016 05:52, Per Jessen wrote:
Gregor Riepl wrote:
It is truly weird. Using the same sender and same path, one email to "some.user@hotmail.com" is accepted, another to "postmaster@hotmail.com" is rejected.
They are probably ramping up rejection rates slowly, as suggested here: https://dmarc.org/overview/
After I filed a support request with Microsoft, they got back to me fairly quickly and said one of our IP-ranges was "a candidate for mitigation". No other explanation offered. I don't see this being a dmarc issue at all, but some sort of internal M$ "reputation list".
Thanks for everyone's suggestions!