This is a bit OT, but I figured I could get an answer here. We are having a problem with our backend server filling up the root mailbox with NDRs of users that are no longer with the company and I am trying to get my brain wrapped around the whole SMTP process. When sendmail relays a messages to our backend server (Lotus Notes), does the server queue it up, then spit back an NDR to the from address of the original email, or is the NDR error send back during the SMTP transaction? I thought that when the front end server relays it back to the back end the server the backend server accepts it, then determines if the user if valid and if the server is supposed to accept email for that user and then sends an NDR back to the originating sender or is it different for each type of mail server? The problem that we are running into is that all the NDRs and errors fill up roots (Postmaster) mailbox and the /var/ runs out of space and then we have issues with sendmail. I changed the alias for postmaster to another external address in hopes of eliviating the problem until we can get it figured out. Any ideas would be appreciated. --Mike
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