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Re: Possible MX Lookup/Ordering Issue

From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Thu Nov 01 2007 - 12:05:10 CDT


On Thu, Nov 01, 2007 at 04:38:38PM +0000, gordanbobich.net wrote:

> It didn't occur to me that there would be connection attempts listed
> without the queue id of the message the connects were attempted for. How
> would one, in that case, relate a connection to a message?

    http://archive.netbsd.se/?ml=postfix-users&a=2007-11&m=5575252

        Your anecdotal observations are flawed. Postfix makes new
        connections to the MX hosts in the order supplied by DNS. Claims
        to the contrary need to be backed up with detailed logging for the
        transactions in question, including not only the final delivery
        success/fail indication, but also any prior connection attempts
        or partial deliveries.

    http://archive.netbsd.se/?ml=postfix-users&a=2007-11&m=5575618

        Your assessment of the probability is likely in error. Typically,
        the debug logs are not needed. Just include all logging from
        "postfix/smtp" (not postfix/smtpd) for a few minutes before and
        after a "failure" to use the best MX hosts.

Only status=sent/bounces and final failure for status=deferred (after
exhausting all MX hosts) are logged with the queue-id. Connection attempts
are logged without the queue id, but carry the same process-id as the
final final bearer of bad news. The messages in question are those for
the same pid, that immediately precede the queue-id in question and lack
a queue-id.

--
        Viktor.

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