I don't understand your response. Sorry... The proposal is to pair
virt.dom.ain ("Sendmail style") with nosuchuser.virt.dom.ain ("Postfix
style"). The "Postfix-style" domain bounces unknown (not listed in the
virtual map) users in the "Sendmail style" domain:

    knownvirt.dom.ain -> known-virtuallocalhost DELIVER
    unknownvirt.dom.ain -> unknownnosuchuser.virt.dom.ain BOUNCE

The only anomaly is that the bounce is "delayed". Instead of an SMTP 553
reply, a bounce is sent to the envelope sender. This even allows one
to implement virtual domains where some of the recipients addresses are
left unchanged by the virtual rewrite:

    known1virt.dom.ain -> known1virt.dom.ain DELIVER
    known2virt.dom.ain -> known2real.dom.ain DELIVER
    unknownvirt.dom.ain -> unknownnosuchuser.virt.dom.ain BOUNCE

Admittedly this is more about virtual domains, rather than virtual
mailboxes.
It is merely a patch free mechanism to allow bounces for users not listed in
the virtual map when the output domain of the rewrite can be the same as
the input domain.

--
        Viktor.
> Victor Duchovni wrote:
> >
> >         There is a simple trick that solves the "how to reject"
> problem without
> > code changes.  The recipients are rejected after the mail is
> accepted rather
> > than in smtpd.  Some consider not rejecting invalid addresses
> in SMTP to be
> > a feature (makes it harder to fish for valid recipient addresses), I
> > personally think that it is a tolerable misfeature of the approach.
> >
> >         The basic idea is to structure the configuration as follows:
> >
> > /etc/postfix/main.cf:
> >         virtual_maps            hash:/etc/postfix/virtual,
> hash:/etc/postfix/nosuch
> >
> > /etc/postfix/virtual:
> >         nosuchuser.virtual.domain       whatever
> >         user1virtual.domain            user1-virtual
> >         user2virtual.domain            user2-virtual
> >
> > /etc/postfix/nosuch:
> >         virtual.domain                 nosuchuser.virtual.domain
> >
> >         Known users in virtual.domain get resolved to
> appropriate local names.  Non
> > existent users get rewritten to
> unknown.usernosuchuser.virtual.domain and
> > this is bounced in qmgr/nqmgr.
>
> Oh ma, that *must* be done in qmgr anyway, instead of making this
> ugly hack.
> Qmgr *must* reject mail to non-exited user (or virtual delivery agent for
> that matter), there should be no situation like "I don't know what to do
> with this destination address" at all (address should either deliver or
> bounce).
>
> Regards,
>  Michael.
> -
>
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