You need to start here for help: https://sendersupport.olc.protection.outlook.com/snds/
~ Matt > On Dec 10, 2020, at 12:11, Nate Burke via mailop <[email protected]> wrote: > > Hello, I was hoping someone from Microsoft could contact me offlist for help > getting our server (66.151.17.22) removed from the Microsoft blacklist. I'm > having problems sending to outlook.com/msn.com and others with domains hosted > at office365. I can't find any issues with the server, and I don't appear to > be on any other blacklists, but all messages to Microsoft are either getting > rejected or sent to the spam folder. The mailserver has been at this IP for > many many years, but these issues just started about 10 days ago. > > Any help would be appreciated. > > Error message; > > <<< 550 5.7.1 Unfortunately, messages from [66.151.17.22] weren't sent. > Please contact your Internet service provider since part of their network is > on our block list (S3150). You can also refer your provider to > http://mail.live.com/mail/troubleshooting.aspx#errors. > [BN8NAM12FT057.eop-nam12.prod.protection.outlook.com] > > The link does not appear to have any way for admins to view/remove the server > from the blacklist. > > > Thank you, > Nate Burke > Blast Communications > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop
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