Why not just check to see if the email address is valid and if not reject the email. What you are proposing violates email standards. First look at http://www.unixworks.net/papers/wp-020.pdf Check out Microsoft KB 842851 for setting up a SMTP tar pit feature. See the link below to set recipient filtering to reject email not in your directory http://www.microsoft.com/technet/prodtechnol/exchange/guides/E2k3TransnR outing/3c7bc0e9-c424-4775-8817-4e9a91d77655.mspx?mfr=true Info at http://blogs.technet.com/dlemson/archive/2003/10/17/52019.aspx Douglas Jensen Douglas.Jensen@xxxxxxxxxxxxx <mailto:Douglas.Jensen@xxxxxxxxxxxxx> Voice (952) 402-9821 Fax (952) 402-9815 Network Administrator Scott Carver Dakota CAP Agency, Inc. 712 Canterbury Road Shakopee, MN 55379 www.capagency.org <file:///C:/Documents%20and%20Settings/djensen.SCDCAP/Application%20Data /Microsoft/Signatures/www.capagency.org> ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Bruce J. Rose Sent: Wednesday, June 07, 2006 9:19 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Deliver emails for invalid account to Postmaster Is there a way for emails sent to an invalid accounts to be sent to Postmaster account then setup a rule to dump them? Email system is as below. Exchange 2003 standard sp2 Windows 2003 sp2 Thanks Bruce