I've had good success with this listserv list
definition:
* Attachments= NO,filter
YMMV
Also, try sending the "bad" email to yourself, perhaps at a
different email address, and then look at the raw data e.g., MIME
headers, etc. That will give you clues.
[or maybe it was a listserv prank on All Saints' Day? ;-) ]
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http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTOWN-L&A=1