Hi all, i am new to IIS 5 and SMTP. I have a question. I am unfamiliar with the 'Delivery Tab' in IIS 5. What exactly are the Delay Notification and Expiration timeout properties? The default settings are 12 hours for the Delay Notification and 2 days for the Expiration timeout. Does this mean (Delay Notification) that i will not be notified of a failed delivery or get an 'NDR' until 12 hours. Also, there are 2 sets of the above, one in the Outbound section and other in Local, what is the difference? If anyone can point me in the right direction (been all over microsoft's site) or outright answer my question, i would appreciate it.