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...
Did anybody see some progress in this? At our side IP's are still blocked and no reaction from Microsoft
I have a Microsoft support engineer helping me. He emails and calls often. So it’s good there is someone BUT I don’t understand why they can’t find the problem. He keeps asking for me “try again” but it’s not fixed. They can’t see my IP in a blocklist. It’s very strange but also unbelievable no one at Microsoft can find the reason. We’re on the 3rd day of blocks now and due to Christmas I doubt it’s a priority for them.
