Forum Discussion
Impersonation attempts of myself to external domains for Emails
Set up impersonation policy for internal domain, but was unable to do so for external recepient domain, where my Email and name is being impresonated and per O365 support there is no tool to do so. D...
I do not fully understand the question - you want to prevent spoofing?
In essence, as sender this isn't 100% possible as it always depends on the receiving end to perform authentication and verification of mail by sending host (SPF), domain keys (if applicable) etc. Only thing you can do is publish the proper information so receiving end can perform authentication and verification.