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My email domain has "Require that all senders are authenticated" in our Microsoft Exchange 2019 on-premise server. Now we have an outside domain that
we need emails from. Without unchecking that option how do I receive emails from that outside email domain? is there a way to add the outside domain
to the trusted list?
Thank You
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Agree with the suggestions below from Andy, we could use transport rule to meet this need.
Below threads discussed the similar issue as yours:
Is it possible to lift the 'Require that all senders are authenticated' restriction for specific external users?
Exchange not accepting email from SMTP relay for users with "require all senders are authenticated" checked
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The way to that generally is to uncheck that option on the user or group, then create a transport rule that blocks all messages sent from outside the org to that object except from that domain.
Example:
or:
