Gregor Riepl wrote:

>> It is truly weird.  Using the same sender and same path, one email
>> to "some.u...@hotmail.com" is accepted, another
>> to "postmas...@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!


-- 
Per Jessen, Zürich (4.0°C)
http://www.hostsuisse.com/ - dedicated server rental in Switzerland.



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