Forum Discussion

dweekley's avatar
dweekley
Copper Contributor
Jan 28, 2020

Exchange Mail Flow Rule

I have created a mail flow rule blocking a group from sending emails outside of the organization.  This is working fine. I am attempting to create a rule for the same group so they can not receive e...
microsoft 365 admin center
VasilMichev's avatar
VasilMichev
MVP
Jan 28, 2020

Hard to tell without seeing the rules, but you can run a message trace to confirm the message is being blocked by some rule. You don't need transport rules for that btw, just toggle the -RequireSenderAuthenticationEnabled flag.

dweekley's avatar
dweekley
Copper Contributor
Jan 28, 2020

Sorry for the extra message. 

 

What I just thought of regarding authentication, all users in that group are not authenticated.  They are using the web to log into emails.  No AD account being used..

 

I just came across 'Delivery Restrictions' that is available with in the users configuration.  That seems to be a viable solution.  Place ALL into that group an they should only receive from them?

 

  • VasilMichev's avatar
    VasilMichev
    MVP
    Jan 29, 2020

    Yes, the delivery restrictions is what I meant, and the flag I mentioned distinguishes between internal and external users as explained by samuela2395