Your message did not reach some or all of the intended recipients. Subject: still trying invoices The following recipient(s) could not be reached: sandy@ags-llc.net on 6/1/2008 1:41 PM Could not deliver the message in the time limit specified. Please retry or contact your administrator. <exchange-server.domainname #4.4.7> ___________________________________________________________ From: postmaster@domainname.com [mailtoostmaster@doaminname.com] Sent: Monday, June 02, 2008 9:37 PM To: User Name Subject: Delivery Status Notification (Delay) This is an automatically generated Delivery Status Notification. THIS IS A WARNING MESSAGE ONLY. YOU DO NOT NEED TO RESEND YOUR MESSAGE. Delivery to the following recipients has been delayed. kumainc@comcast.net I keep getting this returns ontwo users on my network. I cant figure out why is a continuing issue.

Have you got a PIX or ASA firewall with ESMTP deep packet insepction enabled in front of your exchange server?

I have a ASA firewall, but how to i enable esmtp on it?

you actually want deep packet inspection disabled. i believe it is enabled by default http://exchangedeepthoughts.blogspot.com/2007/10/esmtp-and-pix-firewalls.html