Recently I setup an Exchange 2016 Server. Everything looks fine except the Exchange 2016 default Receive connector allows internal relay.
Eg: Two emails email@example.com and firstname.lastname@example.org in my domain abc.com. An anonymous user can send emails to email@example.com on behalf of firstname.lastname@example.org (no authentication required). But if anonymous user try to send email to email@example.com using firstname.lastname@example.org, Exchange will refuse to send it.
May I know how could I do to restrict user authentication even for emails in the internal domain? I cannot disable the Anonymous users otherwise Exchange server will not receive any emails.
Your standard internal receive connector should, assuming you use outlook clients Only accept authenticated MAPI connections. Why would you have port 25 on an internal connector?
The external connector
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