When Microsoft 365 adds the IP address to the list, it prevents all further communication between the IP address and any of our customers through our datacenters. Your mail server's IP address, that is, the address your mail server uses to identify itself on the Internet, was tagged as a potential threat to Microsoft 365 for one of a variety of reasons.
Microsoft uses the blocked senders list to protect its customers from spam, spoofing, and phishing attacks. Microsoft Defender for Office 365 plan 1 and plan 2Īre you getting an error message when you try to send an email to a recipient whose email address is in Microsoft 365 (for example and address 5.7.511 Access denied)? If you think you should not be receiving the error message, you can use the delist portal to remove yourself from the blocked senders list.
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