Forum Discussion
AmityWeb2021
Dec 22, 2021Copper Contributor
Trying to find help for 550 5.7.511 Access denied, banned sender
I run a mail server for many business clients of mine. Microsoft have blocked our IP address, so we cant send to Office365 email addresses. I get a bounce back saying: host cr-studio.mail.protec...
MikkoS42
Dec 25, 2021Copper Contributor
Sad hey,
You're not alone: https://docs.microsoft.com/en-us/answers/questions/674558/550-57511-access-denied-banned-sender.html
I hope they will get it "fixed" soon.
You're not alone: https://docs.microsoft.com/en-us/answers/questions/674558/550-57511-access-denied-banned-sender.html
I hope they will get it "fixed" soon.