Forum Discussion
Distribution Group External Senders Restriction
I have a distribution group under Exchange Server 2016 which should not receive mail from external users. I checked the option "Only senders internal to my organization"(see screenshot attached). But...
If you have the RequireSenderAuthenticationEnabled set to true, meanwhile, emails that delivers to the Distribution Group are only GMAIL and do you mean that after creating a new Distribution Group, issue still persists?
Then you might be looking at analyzing the message header to see what is making the email past the server.
Before then, you can confirm if there are any transport rules set to allow emails from domain Gmail to deliver.
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Hello, we have constated that are now receving email from alls external users event if the parameter requireSenderAuthenticationEnabled is set to True,
We really need a help.
