Interesting article over at Krebs On Security:
http://krebsonsecurity.com/2011/09/right-to-left-override-aids-email-attacks/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+KrebsOnSecurity+%28Krebs+on+Security%29

It talks about a unicode character that reverses ordering from right to left
that had apparently been used to change the order of characters.  For
example, making:
thefilenamedoc.exe
display as
thefilenameexe.doc

I've not seen this, but was wondering if there's a way to have ASSP block
emails with an attachment that has this unicode character.  Some thought
might be necessary if we're going to consider url's that also have it.
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