>What is the best syntax to use for message rules to stop double extension
>file attachments?

FWIW, there are a lot of legitimate files with double extensions -- the 
most common is probably "www.yahoo.com.lnk", but there are also files such 
as "may.1999.results.xls".  So even if you do block double extensions, you 
will likely block some legitimate files, too.

                                                    -Scott
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