Re: Challenging Local Sender/Recipient Spam

From: mouss (no email)
Date: Fri Mar 07 2008 - 08:04:41 EST

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    Gary C. New wrote:
    > We are having an issue with spammers making raw socket
    > connections to our postfix server, spoofing one of our
    > mynetworks domains, and having the server deliver it
    > to a valid recipient in the same mynetworks domain.
    > We have smtp auth configured and working, but this
    > method of spamming is unchallenged due to it being
    > viewed as a valid mynetworks domain.
    > What is the best way for postfix to challenge this
    > method of spam? We've already explored the
    > reject_sender_login_mismatch feature, but it is too
    > aggressive for our environment. Essentially, we need
    > to ensure that the sender is smtp auth'ed before
    > sending a message, regardless of being a valid
    > mynetworks domain.

    you can use
    which only applies to unauthenticated mail.

  • Next message: mouss: "Re: failover for check_policy_service"

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