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Runs under the same user as qmail-smtpd and as such may not be able to access
users' files. It does not have any special support for vpopmail, fastforward,
or bouncesaying, i.e. all .qmail-default files are considered catch all.

http://code.dogmap.org/qmail/

=item qmail-verify daemon + patch for qmail-smtpd

Written in C, checks against qmail-local logic and dot-qmail using a daemon.

In hindsight, my solution was probably mostly inspired by this nice piece of
software. A light weight daemon works together with a patched qmail-smtpd, and
they communicate through UDP. A single bit, 0 or 1, determines the fate of the
current message. While possibly susceptible to spoofing and race conditions,
that's unlikely because all the malicious hacker can probably accomplish, is
that email is rejected.

Unfortunately it has no support for vpopmail, bouncesaying, or fastforward.

This solution is networked and lets you pick the server based on the connecting
host. That's almost sufficient for using the client on a mail hub, which