From: Wietse Venema (wietseporcupine.org)
Date: Sat Feb 12 2005 - 15:19:20 CST

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Miguel M:
> How do I configure postfix to make the first delivery attempt directly, and
> if the e-mail is bounced make the second attempt via [myisp.example.com]?

Currently, when the receiving MTA rejects helo, sender, recipient
or data, then Postfix deletes the recipient from the queue file
and sends a non-delivery report.

For testing purposes, Postfix has a soft_bounce feature that causes
recipients to always be deferred instead of bounced.

What you need would involve a very small change: turn on the soft
bounce behavior in the SMTP client.

This can't be automatical when fallback relay is specified. Some
sites use fallback relay to off-load the main MTA and don't want
to ignore bounces.

Try this in master.cf

smtp unix - - n - - smtp
    -o soft_bounce=yes

This limits soft_bounce to just the SMTP client.

If that helps then we could introduce a new configuration parameter
so that there is no need to clutter master.cf.

        Wietse

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