That looks like the standard Office365 "you got listed" message. Even legitimate B2B bulk mail will now and then generate these. Just follow the instructions; delisting is straightforward. If it recurs, of course, you might have a troublesome mailer on your hands.
John On Mon, Jun 25, 2018 at 12:24 PM, Josh Campbell <[email protected]> wrote: > Has anyone else noticed these errors? We hadn't really seen them > previously. They look like this: > > smtp;550 5.7.606 Access denied, banned sending IP [xxx.xxx.xxx.xxx]. 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 (AS16012609) [ > AM5EUR03FT031.eop-EUR03.prod.protection.outlook.com] > > We've only started seeing them in the past month and only a small amount > of IPs have been affected at any one time. > > The interesting thing is all of these IPs are in the same IP range (out of > the three major ranges we have). > > I'm wondering if this is a new phenomenon for anyone else and why it only > appears to affect one of my IP ranges. (Also, if anyone from Microsoft > cares to get in touch, I'd love to hear from you.) > > Josh Campbell, Deliverability Engineer > MailChimp > > > _______________________________________________ > mailop mailing list > [email protected] > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > >
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