My main employer (CipherSpace) runs a mail system with a few dozen SMB customer domains and a long low-volume history of good behavior. ~2 weeks ago we had an end-user password cracked an a very sneaky spammer managed to get through a couple thousand spams over the space of about a day, at a slow and steady pace via webmail. It got our outbound IP throttled briefly at Yahoo/Oath, cleared up in short order. I mention this because it is our only incident in many months (years?) and has been followed (maybe coincidentally) by our first collision with the infamous Microsoft S3150 block since we switched to funneling all of our outbound to a single IP a couple of years ago. That merge was a response to chronic flickering S3150 problems without any discernible cause hitting single-client outbounds seemingly at random. It seems like bundling the volume helped maintain a good-enough reputation on the merged outbound (74.115.114.191) for the problems to subside, until this weekend.
We have JMRP and SNDS set up. We've never received a single report. No addresses have issues according to SNDS. JMRP has never sent us a single report, as far as I can tell. I have done the dance at https://sender.office.com to get delisted, trying 3 different email addresses before finally discovering that the email confirmation messages it sends are so broken that SpamAssassin *AND* Outlook.com's filters think they are junk in ridiculously bad ways. The issue has supposedly been escalated to Microsoft Support thrice, after I worked around the fact that MS thinks their own administrative mail is junk... Meanwhile, my boss tried working another route and has opened 2 tickets: SRX1544040988ID asking for just the one IP and SRX1544076120ID for the whole /24. Got the dreaded "Not qualified for mitigation" boilerplate response to both. What is the way out of this? It feels a lot like intentional anticompetitive behavior, but I'm paranoid. -- Bill Cole [email protected] or [email protected] (AKA @grumpybozo and many *@billmail.scconsult.com addresses) Not Currently Available For Hire
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