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Thread: SMTP on Multiple Ports?

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  1. #1
    Join Date
    May 2006
    Reston, VA
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    Default SMTP on Multiple Ports?

    How would I go about setting Zimbra to listen on 2 ports for SMTP? I have one user's ISP that blocks outbound port 25. I would like to configure my server so some users could select a non standard port for SMTP. I have read several posts about using smart relays when users have their Zimbra Servers on ISP's that blocks port 25, but my situation is a little different since it's just the user's ISP, not the server's ISP.

  2. #2
    Join Date
    Sep 2005
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    Or, edit to add an smptd on another port (don't remember the exact syntax - look it up):

    myhostname:4000 ... smtpd

    Please test to make sure mail gets routed through amavisd = if not you might have to configure the content_filter option on above line (though I doubt you need to.)

    Please post your solution - for the record, thx.

    We may not preserve across upgrades - so lookout for that.
    Bugzilla - Wiki - Downloads - Before posting... Search!

  3. #3
    Join Date
    May 2006
    Reston, VA
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    Smile Fix

    Port fowarding via iptables seemed to do the trick for me.

    iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 465 -j REDIRECT --to-port 25

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