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All the Perl that's Practical to Extract and Report

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  • If your focus in on saving the bandwidth (man, that's a lotta e-mail!), then you need to do as much upfront testing as possible (before the client gets to the "data" section of their e-mail). You may also not want to REJECT, which would double the bandwidth with bouncebacks (not sure if the original message is bounced back, too).

    I love Postfix -- they have some really great UCE [] measures. I had some problems with "A or MX record" thing (reject_unknown_client?) -- that would block things like stories that
    • For Postfix, I reject during the SMTP handshake, not bouncing it with checks later. Amavis doesn't bounce it either... we just swallow the spam. And I don't bounce anything from my procmail tests or clamscan tests. The only bounces I generate are $ (provided they aren't a spammed-to-death address).
      • Randal L. Schwartz
      • Stonehenge
  • If you want an rbl feed of this list, or a URL to a private text file containing the IPs (both updated once a minute), please let me know (

    The caveat is that there might be false positives. It's useful as an outright smtp block, or at a place where you can return "try again later" to an incoming SMTP connection, but not at a point where you've already accepted the mail. You want a legit mailer to retry, but the bad guys mailers will not.

    • Randal L. Schwartz
    • Stonehenge