Ville Walveranta wrote: > So I'm wondering if it would be possible to accept the mail, blackhole it, > and send a bounce-message to the sender with a "User unknown" message. > User-specific blackholing seems to be easy to implement, but how about the > "user unknown" bounce message? I'd like to be able to "actively notify" > (with a bounce) the sender about non-existence of some old accounts.
It sounds like you just want an autoresponder, something like procmail and/or vacation will probably do what you want. You'll still have to explicitly accept mail for those users and deal with it. Note that this is *not* "bouncing", that's the last thing you want, as it can easily cause backscatter. Similarly, you should be very careful with any such autoresponder that you setup for this.
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