d...@powerstandards.com:
> But if only the user is bad, e.g.
> d...@gmail.com
> the domain just sends back "250 Accepted", 

If the receiving host can't reject non-existent recipients, then
there is NO WAY for the sending Postfix server to determine that
the username is bad. If Postfix could predict that, then I would
be very, very, rich.

        Wietse

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