Hi All,

I would like to know how to block mail to alias from external networks and 
allow from trusted domain. 

presently we have alias a...@xyz.com will redirect to all employee's.

allow:     u...@xyz.com to a...@xyz.com
block:     u...@anydomain.com    to a...@xyz.com




Appreciate suggestions.

Thanks and Regards,
Ramesh

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