The web server in DMZ is not able to send mail to a distribution group in our Exchange 2010. I'm sure the receive connector has been set to allow delivery of internal emails from anonymous users with this command:
and from the log tracking I can see the email did get through the connector but then failed in routing to this distribution group. The error is:
550 5.7.1 RESOLVER.RST.AuthRequired; authentication required
What could be wrong? Could a distribution group be set up to only allow authenticated users to send mail? How to resolve the issue?
Please help. Thanks.
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8/22/2022 - Mon
jmac44
Double check you receive connector in the Exchange management console and make sure it's not set up for authentication see below:
Castlewood
ASKER
But it should be some other issue than of the receive connector as I can see from the log that the email did get through the connector. (see attached.)
As I can see, it is more like a distribution group being set up to only allow authenticated users to send mail. But if that is the case, how to resolve it? web.pdf
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