I'm having an problem figuring out why certian messages can not be received. I have a message that a user is trying to get which is 16 MB in size. On my exchange server I have set through the global settings --> Message Deliver --> defualts tab the sizes set to sending messgae 15360 KB, Receiving message no lmit, and recipient limit 5000. I check the message tracking and an NDR is produced when sent to the user. I tried sending the same mesge to myself as well same result even though in my user property I have the maxium allowable size possible for all categorie for my mailbox limits.