If you have any subscribers at eyenet.eybe.edu.on.ca, you may want to check
the validity of their userids.  That host fails to return mail to the SMTP
MAIL FROM (or Errors-To) address, and postmaster, root, and even
Mailer-Daemon (which sends mail) bounce as "not found" users.
 
Perhaps someone knows a way to contact these folks to let them know they
have a serious compliance problem.  Otherwise, you might want to SERVE out
the host until someone identies at least one userid there that functions.
 
/s Murphy A. Sewall <[log in to unmask]>      (860) 486-2489 voice
   Professor of Marketing                          (860) 456-7725 fax
   http://mktg.sba.uconn.edu/MKT/Faculty/Sewall.html