blocking inbound mail to a specific address in a protected domain

[pwood]

Folks - Exchange 2010 lets you restrict use of internal Distribution Lists to authenticated *senders* only.  However, when an outside user replies to a message that includes the internal distribution list as well as external addresses, Exchange allows that message.

This leads to unwanted Reply to All scenarios occuring.

Can I blocked mail to ADistributionList@ourdomain.com, where ourdomain.com is a protected domain in our Fortimail configuration?

Running Fortimail v5.2, Build 404.

Thanks for any assistance, it is appreciated.  I did review the admin manual but wasn't able to find any item which appeared germane.

Regards - Pete

[Bromont_FTNT · Accepted solution]

Policy --> Access control --> Sender Pattern=External, recipient pattern=ADistributionList@ourdomain.com,Action=reject

[pwood]

That works great.  Thanks very much - I appreciate the speedy and informative response!

Regards - Pete