Hello All, I have ndr emails coming to one mail box and i want to go thru the reason to create the report. I can access the mailbox using vb.net and create my own database on the basis of reason. I want to know where I can get the list of NDR codes. I found this http://www.computerperformance.co.uk/exchange2003/exchange2003_NDR.htm website but some of my message doesn't have x.x.x code but only have 5xx code 550 or 551 etc. Do i need to follow x.x.x codes from NDR or 5xx codes to get the explanation? Thanks in advance. P