We are running Exchange 2003 behind a Barracuda Spam FIrewall. Due to performance issues we recently set thresholds for mailbox size and message send/receive size. Since doing this we've been informed that some users were not getting messages from outside resources. When we check the barracuda it says the message has been delivered, but also notes "Message size exceeded". Even if we force message delivery on the barracuda without the attachment, the message never reaches the recipient mailbox. I'm not sure if the problem is on the barracuda or if exchange is blocking it after the barracuda allows the message to be sent. If exchange is stopping the message, is there a log or area within exchange that these messages are stored and can be viewed or retrieved?