Our Exchange SMTP queue is being swamped by postmaster@ replies going to fake mailboxes reporting that the whatever spam was sent on their behalf did not reach the randomly generated names that do not exist on our server. Is there some way to make the "mailbox not found" replies to try once or twice and then go away? I found the settings for general SMTP sending timeouts and retries, but I want legitimate email to be queued up for 2 days as usual and the postmaster@ replies to timeout after one or two tries. Is there a way to do that? Maybe to filter it based on sender?
The server is 2003 SBS.