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timestamp spam filter

1997-10-17 10:13:35

What recipe would catch "bad timestamps?"


  "... a specific program
  that many spammers use has a bug that you can exploit in a filter.
  This program's forged headers use the timestamp of "-0600 (EST)".
  However, Jason notes that Eastern Standard Time is usually marked
  "-0500 (EST)" and Eastern Daylight Time is "-0400 (EDT)". Thus,
  filtering messages with the bad timestamp will catch either spam
  from this particular program or mail from incorrectly configured
  mail servers."


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