Linksys RV082 Firewall Access Rule and port forwarding

I'm attempting to restrict SMTP traffic to only accept from Trend Micro's IP Range, as we use their hosted A/V, Spam service.  
I set up a firewall access rule to accept SMTP sourced from  limited to Trend Micro's IP Range


How do I test the firewall restrictions once implemented?

My experience with this is quite limited so please be specific.  Thanks in Advance!
bigsleeperAsked:
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lrmooreCommented:
Have someone try to telnet to your public ip, port 25. If they can't get anything, and email is still coming in, then your rules are working properly.
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bigsleeperAuthor Commented:
Thanks!
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bigsleeperAuthor Commented:
Success. An external Telnet attempt fails when the firewall rules are enabled and succeeds when disabled, all the while, inbound from trend flows in as expected.  I was concerned as I have read posts stating the this router would give port forwarding priority over firewall rules, effectively ignoring them for port forwarded traffic.  But testing with telnet before and after enabling of firewall rules prove that the router is accurately applying the rules before forwarding.
Thanks for solution!
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