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From: Wietse Venema (wietse_at_porcupine.org)
Date: Mon Dec 02 2002 - 10:21:18 CST

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    Matthias Andree:
    > wietseporcupine.org (Wietse Venema) writes:
    >
    > > By the way, probes will never be tried more than once. They do
    > > not accumulate in the deferred queue.
    >
    > Ok, so mailq is out. Leaves the "you don't get statistics unless the
    > mail is finally delivered" issue -- or assume everything's a probe when
    > it's deferred, which is certainly wrong.

    To clarify, a Postfix probe is identical to regular mail with the
    following two exceptions:

     1) A probe message is not delivered. Postfix records only what
        would happen. Both sender address verification and "sendmail
        -bv" are implemented with the same probe mechanism.

     2) A probe message is discarded rather than being deferred or
        bounced.

    In particular, probe messages are run through the usual circus of
    DNS MX record lookups and trying MX hosts until the SMTP handshake
    succeeds.

            Wietse