Block SMTP Traffic on SonicWall PRO3060 Enhanced OS

On a Sonicwall Pro3060 with Enhanced OS, I need to block all smtp traffic, port 25 from going to WAN.  The only exception for that I need is for our e-mail server to allow for SMTP port 25.  I can't have workstations having ability to have SMTP enabled.

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CreditSoupTechConnect With a Mentor Commented:
Just add an outbound rule denying from LAN to WAN Service SMTP: LAN-->WAN DENY 25
Then add a rule that allows LAN to WAN Source [Internal Mail Server IP] DESTINATION [ANY] Service 25: LAN-->WAN Source x.x.x.x Destination ANY 25

Is that clear enough?  
fireguy1125Author Commented:
Thanks, I was putting in the Destination as "WAN Subnets".  When I changed it to ANY I tested and works.

I always get confused with all the Address Groups that SonicWall has.
Yeah. WAN Subnets is just your WAN address's or your public IP's assigned to the WAN subnet.
very helpful...thanks for the explanation.

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