Forum Discussion
My Tenant is the Victim of a Persistent Email Spoofer
Hi all, for 5 days now a specific user in my tenant has been the target of a mass email spoofing attack. This users email address has been spoofed, and now we're absolutely flooded with "Undelivered ...
Our email domain is fully powered by M365 and Exchange. As far as I'm aware, all of those features are enabled by default. I know at least DMARC is because in the past, a client of ours was not flagging their emails correctly and they would be dropped on our end.