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As Tom is asking - what is Postfix achieving here. Ralf Hildebrandt has written extensively on the perils of Exchange, and how to front end it with Postfix. Unlike Tom I think there is a good case for fronting Exchange with Postfix, not least Exchange is too complex to do almost anything so the less you configure it the less chance of destroying all your email. But do take advantage of Postfix's strengths. Postfix can check (and cache) valid and invalid addresses in a domain it is proxying email for, it can thus do greylisting, and other spam filtering without much risk of accepting an email it can then no longer deliver. http://www.arschkrebs.de/postfix/ To do what you actually describe would need something like VERP but why do it - it seems painful. Makes sense for things like email forwarding, and mail list bounces, but not sure why you are putting this complexity into the email process itself? -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq