What do people do about NDRs that are trying to be delivered to external addresses that do not exist? This is a by product of spam. Email comes in for e-mail address that does not exist and then Exchange tries to reply that the address is not here and but the reply to address is bogus. So Exchange tries for 4 days (or whatever) and then gives up but in the mean time there are tons of queues waiting for retries. My understanding is that you cannot tell Exchange not to send out the NDR. Any thoughts would be appreciated Thanx Goran Jovanovic The LAN Shoppe 2345 Yonge Street, Suite 302 Toronto, Ontario M4P 2E5 Phone: (416) 440-1167 x-2113 Cell: (416) 931-0688 E-Mail: gjovanovic@xxxxxxxxxxx