Forum Discussion
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...
any forward movement on this front? I am getting a little desperate here as its starting to hurt not only my business but also my reputation as an email host - surely Microsoft can ban IPs with surgical precision rather than blocking entire IP ranges - I truly don't understand why we ALL have to suffer because of a couple of bad actors