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Spam Blocking Engine for OpenBSD

Posted by michael on from the two-scoops-white-rice dept.

mkeke writes "In a post over at OpenBSD Journal, Theo states that he has written a spam blocker that works with pf and Spews. It looks darn cool :)"

5 of 278 comments (clear)

  1. 550? 450? by Habbie · · Score: 5, Informative

    I assume he means a 450 reply, not a 550? 550 won't make the message stay in the queue, 450 will.

    1. Re:550? 450? by edgarde · · Score: 5, Informative
      450 says there's still a mailbox there. 550 says not found. Here's a list of SMTP codes.

      Incidentally, the code actually has a command line option to choose between 450 and 550.

  2. Re:difference by bconway · · Score: 5, Informative

    SpamAssassin is nothing more than an advanced filter. This stops the spam before it gets to you and fills up the offending mail servers disk space with it.

    --
    Interested in open source engine management for your Subaru?
  3. Spews is NOT the right way to filter e-mail. by Sturm · · Score: 5, Informative

    Spews is EVIL. Plain and simple. They block IPs based soley on the fact your upstream provider hosts or has hosted in the past, someone the SPEWS "admins" (and I use that term losely) believe to be spammers. It is impossible to get off their list and if you are a customer of C&W you probably have IP space being blacklisted by them. Blocking large blocks of class Cs, just because someone happens to share IP space with an alleged spammer is the WRONG way to filter spam.
    Please take a look at http://www.antispews.org for more information before using SPEWS.

  4. big difference: not just rejecting mail by agshekeloh · · Score: 5, Informative

    It doesn't reject messages. It defers them forever, telling the open relay to "try again later."

    This tool is a weapon against open relays. The goal is to fill up the open relay's hard drives by deferring the incoming mail, rather than just rejecting the messages.

    Yes, you can do this with other blacklists as well, but nobody seems to be actually doing that.