HTTP Proxy Stop SMTP Traffic

I'm trying to create an HTTP policy proxy that essentially stops SMPT traffic on port 80. Is this realistic?


  • james.carsonjames.carson Moderator, WatchGuard Representative

    STMP traffic will usually be on port25/tcp. If there is an http proxy in place and SMTP were trying to traverse port 80 -and- matched that firewall rule, it should be dropped.

    -James Carson
    WatchGuard Customer Support

  • Are you asking about blocking web mail, such as access to Gmail?

  • Thanks perfect.

    I have a block of 5 static IPs - ( - SMTP email is going out on the Ip ending in 4. How do I create a rule that will direct email to go out using the IP ending in 5 instead of 4?

  • edited February 2022

    Use Dynamic NAT on your outgoing SMTP policy.
    You can specify the external IP addr to be used there.
    That option is on the Advanced tab of a policy in Policy manager

  • Awesome!!

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