The spam filtering/mail security system we use for 70 school districts in 
Western NY blocks attachments with extensions that Microsot has deemed to 
be unsafe (See http://support.microsoft.com/kb/291369/en-us ), which 
includes the extension .URL..  A teacher got dropped form a State Ed 
listserv becuase we rejected (554  5.7.1 Attachments  with file extension 
url are not accepted Message rejected by spam filter) the message at the 
SMTP level.

Is there any advice I can pass on to the list owner on how to block that, 
and other unsafe extensions, to prevent future problems and make the list 
safer for all their subscribers?


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In the time it took to read this a Windows exploit was discovered.


William Brown
Web Development & Messaging Services
Technology Services, WNYRIC, Erie 1 BOCES
(716)821-7285