Nov 02 2020 01:54 PM
We setup a mail flow rule in Office 365 Exchange for External Messages. It prepends "External" to the subject and prepends a disclaimer at the top of the message.
My question is -- can we safely exempt domains such as email.teams.microsoft.com ? These are messages that come from Microsoft / Office 365. My concern is -- is there any way for these domains to be spoofed that would fool the mail rule exemption?
Thank you.
Nov 03 2020 12:30 AM
They can be spoofed and you shouldnt be excluding anything based on the email address alone.