Here's on that even an "unsubscribe" filter wouldn't catch (see subject line).

CIAO all,
Martin R. Green
elimar@bigfoot.com

----------
From:   Christopher So[SMTP:soc@XTRA.CO.NZ]
Sent:   Wednesday, August 27, 1997 12:49 AM
To:     PICLIST@mitvma.mit.edu
Subject:        unsubribe

soc@xtra.co.nz