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Can Brightmail detect and reject senders from "Unknown_Domain" origins?

  • 1.  Can Brightmail detect and reject senders from "Unknown_Domain" origins?

    Posted Feb 01, 2011 08:00 PM

    We see a significant amount of spam coming from senders who's originating server IP address does not have a reverse DNS entry.

    The header will show similar to: "Received: from [46.150.229.158] (Unknown_Domain [46.150.229.158])by". Can we assume that legitimate email servers will all have a reverse DNS entry and therefore we should block all messages from an "Unknown_Domain"?

    If so, how would we configure Brightmail to perform this action? We are running Brightmail Gateway 9.0.2-9.



  • 2.  RE: Can Brightmail detect and reject senders from "Unknown_Domain" origins?

    Posted Feb 01, 2011 08:43 PM

    There is a new feature in the upcoming 9.5 release that will allow you to configure an action based on the results of a reverse DNS look-up.  Any action you choose to take should be done with caution to ensure you are not also blocking legitimate email.



  • 3.  RE: Can Brightmail detect and reject senders from "Unknown_Domain" origins?

    Posted Feb 02, 2011 03:54 PM

    Wow, that sounds like an awesome feature.