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Alternate port for SMTP

MillardJK
I've been using an alternate port for SMTP in conjunction with an upstream anti-spam/anti-virus service. The advantage has been multiple: crap traffic that relies on the MX record never finds its way to my WAN link, and crap traffic that randomly selects my WAN IP never gets past the firewall because I block all inbound traffic on port 25.

I will continue to use my external filtering service, but I'd really like to get some assistance in configuring the ASG to proxy for me on inbound messages; I can't see where the mail proxy could be configured for a different port for use in a situation like mine.


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  • 0
    Barry, is there anything you can think of other than some other device in front of the Astaro somewhere that changes the service in incoming packets to hit the Astaro on port 25?  Another router or a smart host or something?
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • 0
    Barry, is there anything you can think of other than some other device in front of the Astaro somewhere that changes the service in incoming packets to hit the Astaro on port 25?  Another router or a smart host or something?
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • 0 in reply to BAlfson
    Barry, is there anything you can think of other than some other device in front of the Astaro somewhere that changes the service in incoming packets to hit the Astaro on port 25?  Another router or a smart host or something?


    Not sure. What if the alternate port is DNAT'd to port 25 with DEST of the EXT interface? Would that make it to the proxy?

    Barry
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