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  1. #1
    Join Date
    Nov 2016
    Phoenix, AZ

    Default spam filtering from internal port


    Can someone explain how Untangle handles spam filtering on port 25 vs port 587?

    I have clients on the outside connecting to my mail server on my LAN, with UT in bridge mode between my router and LAN.
    I'm seeing mail quarantined with a from: address of my clients, going to outside contacts of theirs. I'm seeing the client successfully connecting to the mail server, dropping off mail, and then seeing it on a quarantine list for the intended recipient outside our network.

    I'm thinking this has to be related to port 25 vs 587 traffic. It is just a guess, though.



  2. #2
    Untangler jcoffin's Avatar
    Join Date
    Aug 2008
    Sunnyvale, CA


    Spam filtering is only on port 25. If you have "Scan outbound (WAN) SMTP" enabled, then recipients will receive quarantine messages.
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