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messages to non-existant recipients passing through ?

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  • messages to non-existant recipients passing through ?

    Ok - this seems odd to me, but I'll let you in on what's going on - maybe you can throw some light on it for me.

    For email, we use Exchange 2003 at the front end. We've got IMF enabled, and then it bounces through Trend Micro Scan mail for exchange after delivery.

    Anyway so, every 4 hours, I get emails from TRend Micro with the antivirus warnings, and i'm noticing emails from sender [email protected] to recipient [email protected]

    Needless to say, hmax is not an account that exists. So - how is the mail getting through for Scanmail to detect it's got a virus, surely Exchange should be going "no, that recipient does not exist..."
    ?
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  • #2
    Re: messages to non-existant recipients passing through ?

    although maybe i've got it ass-about.. cause I can't see those emails in the message tracking centre at all..
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    • #3
      Re: messages to non-existant recipients passing through ?

      Not sure about Trend, but I do know that some AV engines hook into it such that the AV engine sees the email before Exchange does, hence the symptoms you're seeing.
      Best wishes,
      PaulH.
      MCP:Server 2003; MCITP:Server 2008; MCTS: SBS2008

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      • #4
        Re: messages to non-existant recipients passing through ?

        Yes, many third party providers will inject their scanning logic into the SMTP engine itself, so the AV could definitely deal with the message before Exchange recipient filtering kicks in.

        I have seen this with Mcafee Groupshield and Sophos Puremessage.

        Shaun

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        • #5
          Re: messages to non-existent recipients passing through ?

          Recipient Filtering needs to be turned on in Exchange 2003. By default Exchange will accept the email and then attempt to NDR it back.

          http://www.amset.info/exchange/filter-unknown.asp

          Simon.
          --
          Simon Butler
          Exchange MVP

          Blog: http://blog.sembee.co.uk/
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