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Spam: Multiple recipients with 1 legit address and Mercury forwards the lot

  •  07-28-2008, 8:01

    • NFG is not online. Last active: 07-16-2019, 4:18 NFG
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    Spam: Multiple recipients with 1 legit address and Mercury forwards the lot

    I noticed a rather serious problem today:

     

    My system's set up to block illegitimate mail.  I demand authentication to relay and I greywall, but today a piece of spam came through with one legitimate address for a local user, and about 12 users on other systems in the CC/BCC fields.  Because one user was legit the message was accepted by Mercury, processed, and 12 messages forwarded to other systems.

     

    This strikes me as a rather serious security hole, and I really don't know how to stop it.  Any suggestions?

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