The | character is not allowed in any e-mail address because it's a Unix 
shell reserved character.

Here's a list right off the top of my head that are usually 
blocked/disabled by just about every MTA out there.

   1. Control Characters
   2. Space
   3. !
   4. "
   5. #
   6. $
   7. %
   8. &
   9. (
  10. )
  11. *
  12. ,
  13. /
  14. :
  15. ;
  16. <
  17.  >
  18. @ (when used more than once)
  19. [
  20. \
  21. ]
  22. |
  23. DEL


Bas van Rooijen wrote:
> ClamAV is rejecting messages where the recipient address contains a | (pipe 
> character)..
>
> Why is this? Is | a virus now?
>
> Can this behaviour be disabled?
>
> Are you planning on blocking other random characters from appearing in the 
> recipient adres?
>
> thanks,
> bvr.
>
> _______________________________________________
> Help us build a comprehensive ClamAV guide: visit http://wiki.clamav.net
> http://lurker.clamav.net/list/clamav-users.html
>
>   
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