They also have been generating a low volume of false positive bounces which refer to Spamhaus listings which don't exist. Impact seems to be 0.03% - 0.05% of mail to Office 365.
Microsoft is aware of both of these issues. On Mon, Apr 7, 2025 at 7:22 AM Jarland Donnell via mailop <mailop@mailop.org> wrote: > Hey friends, > > Has anyone successfully navigated this problem that might be able to > offer any advice? I've not seen it go down like this before. A few IPs > are returning this from Microsoft: > > "550 5.7.606 Access denied, banned sending IP [136.175.108.9]. To > request removal from this list please visit https://sender.office.com/ > and follow the directions. For more information please go to > http://go.microsoft.com/fwlink/?LinkID=526655 AS(1427) > [SJ1PEPF000023D7.namprd21.prod.outlook.com 2025-04-07T11:42:49.557Z > 08DD73CA256694C7" > > Yet, when using sender.office.com as instructed, each time it returns: > "The IP address in question is not currently blocked in our system" > > SNDS portal reports no issues, though I'm not sure it ever reports > anything there as I can't recall the last time I ever saw that change. I > appreciate any advice on this. > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
_______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
