I was wondering if I can achieve this in my organization:
Some distribution groups have non-default names to avoid SPAM (e.g. firstname.lastname@example.org is email@example.com).
Can I set the RequireSenderAuthenticationEnabled to an specific alias?
So I can have a default alias that's is only internal and one non-default that it's for external messages.
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Nope, it will apply to messages sent to any alias of the DG. If you want to target a specific one, use Transport rules.
Thanks Vasil Michev!