Michelle, Try enabling recipient filtering to prevent spammers attempting to 
send email from non-existent domains, and to prevent them sending to [EMAIL 
PROTECTED]  In ESM > Global settings > message delivery > properties > 
recipient filtering and tick the filter recipients who are not in the 
directory.  Next go to your Admin Group > servers > smtpserver > protocols > 
smtp > default smtp server > properties > ip address advanced > edit > enable 
filter.

This cut down hugley on the number of NDR's our server was sending (5000 per 
day!)

Tim
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