I have a limit of 6mb for attachment size setup on our 2003 exchange server. As far as I can tell, it's sending out e-mail to the sender notifying them of the rejected e-mail. The problem is that, either it's not sending out, or the sender is somehow blocking the rejection. The intended recipient does not receive notification. We have clients following up a week later asking about an e-mail they sent that they thought was received. What cab I check on the sever, change or work around to rectify this? Am I missing a setting or should I modify the way the notification is sent?