Steve Heaven a écrit : > On Mon, 2009-09-07 at 11:50 -0400, Sahil Tandon wrote: > >> >> You should not accept mail for invalid recipients. Use existing >> functionality to build a cache/database of valid recipients "on the fly". >> See: http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient > > We have no way of knowing if the recipient address is valid or not as we > are only acting as a relay for the final destination. > We cannot build a database of recipients on the fly as that information > is held on the various servers of our clients, to which we do not have > access.
the old: "try to pass to next, until final server accepts or rejects" is n more acceptable. recipients must be checked at the "edge". postfix provides reject_unverified_recipient to help you for that (assuming the next relay really validates the recipient). It's been a time that most people acknowledge that backscatter is a problem. those who take a selfish approach to mail should not be surprised if they are blacklisted, and should not ask for help.
