It seems our SMTP\Queue is filling up faster than it is delivering to the recipients. I've had to disable the SMTP firewall rule in ISAto give it a chance to clear out. Quantity of emails flowing into our system is normal, as is the typical (average) size of email items in this queue directory. I am looking for a solution as to why the queue isn't emptying (onto the intended recipients). Any ideas? BTW: latest version of Exchange Cheers! Andrew