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DanFlag for United States of America

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Exchange 2013 restricting email to "only senders inside my organization"

I'm running exchange 2013 and I'm trying to restrict DL's to only receive email from "only senders inside my organization".
I found the option, it's checked, but it doesn't work, as I have some emails failing wth the error "550. 5.7.1 Resolvever.rst"

That's because I had to turn off the option "externally secured" on one of my receive connectors.
If I enable the "externally secured', then anyone can send to the Distribution Lists again even though the option to "only senders inside my organization" is checked.  

I couldn't find a fix for this online, so perhaps I missed something?
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Amit Kumar
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comes back with:  requiresenderauthenticationenabled: true
Avatar of Simon Butler (Sembee)
Externally Secured is not normally enabled on Receive Connectors, as that turns the connector in to an open relay.

Are users sending exclusively via Outlook Anywhere, or do you have POP/IMAP users as well?

Simon.
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We have a setup with an external web server, that acts as an SMTP relay, so for 1 receive connector, I have to have the "externally secured" on, otherwise, when we send out our mass emails to everyone on our lists, the job doesn't run.   After I turned on the externally secured, it worked fine.

Not sure if there's a work around this problem?
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