>         The client then sends a DATA request, and waits for the
>         response:

One major reason for bounce generation is mail for nonexistent recipients.
As qmail-smtpd is unable to check recipients, it accepts mail for any
localport. Of course such wrong recipients can and should (as done by
qpsmtpd) be rejected at rcpt to and never get to the DATA phase in the
first place.

Regards
Michael

-- 
      It's an insane world, but i'm proud to be a part of it. -- Bill Hicks

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