I have a minor postfix-internals question.

When smtp takes a long time to deliver a message, and a
postfix reload occurs during that time, qmgr sees that the
message is still being delivered and so defers the queue
file from active back to incoming. When smtp returns, qmgr
does know to move it back from incoming to active before
taking appropriate action (deferring or deleting). But
isn't it easier for the qmgr to just leave it in active?
That's what the nqmgr does. While I understand most of the
other things that go on behind the scenes, I'm curious about
the (historical?) reasons behind this particular design
decision.

From src/qmgr/qmgr_active.c

     * After queue manager restart it is possible that a queue file is still
     * being delivered. In that case (the file is locked), defer delivery by
     * a minimal amount of time.
     */

    } else if (message == QMGR_MESSAGE_LOCKED) {
      if (msg_verbose || 1) msg_info("%s: message is locked, deferring back to incoming queue. why?", queue_id);
        qmgr_active_defer(MAIL_QUEUE_ACTIVE, queue_id, MAIL_QUEUE_INCOMING, 60);
        return (0);

I added some verbosity to the latest 20010808.

18:23:43 cleanup[3145]: 2FCB23E633: deleting queue file under defer
18:23:43 cleanup[3145]: 2FCB23E633: deleting queue file under bounce
18:23:43 cleanup[3145]: 2FCB23E633: message-id=<20011001222325.2FCB23E633cali-2.pobox.com>
18:23:43 qmgr[2034]: 2FCB23E633: moving from incoming -> active
18:23:43 qmgr[2034]: 2FCB23E633: from=<>, size=6640, nrcpt=1 (queue active)
18:23:43 qmgr[2034]: 2FCB23E633: deleting queue file under defer
18:23:43 qmgr[2034]: 2FCB23E633: assigning recipients to delivery requests and closing messagefile.
18:23:43 qmgr[2034]: 2FCB23E633: qmgr_deliver: attempting send request to transport=smtp, recipient=knedrgrservicenetbest.com
18:23:43 qmgr[2034]: 2FCB23E633: qmgr_deliver finished writing to transport=smtp, recipient=knedrgrservicenetbest.com
18:23:43 smtp[2245]: 2FCB23E633: handling request from to knedrgrservicenetbest.com
18:30:58 qmgr[4884]: 2FCB23E633: moving from active -> incoming
18:30:58 qmgr[4884]: 2FCB23E633: moving from incoming -> active
18:30:58 qmgr[4884]: 2FCB23E633: skipped, still being delivered
18:30:58 qmgr[4884]: 2FCB23E633: message is locked, deferring back to incoming queue. why?
18:30:58 qmgr[4884]: 2FCB23E633: deferring from active to incoming
18:30:58 qmgr[4884]: 2FCB23E633: moving from active -> incoming
18:31:57 qmgr[4884]: 2FCB23E633: moving from incoming -> active
18:31:57 qmgr[4884]: 2FCB23E633: skipped, still being delivered
18:31:57 qmgr[4884]: 2FCB23E633: message is locked, deferring back to incoming queue. why?
18:31:57 qmgr[4884]: 2FCB23E633: deferring from active to incoming
18:31:57 qmgr[4884]: 2FCB23E633: moving from active -> incoming
18:32:58 qmgr[4884]: 2FCB23E633: moving from incoming -> active
18:32:58 qmgr[4884]: 2FCB23E633: skipped, still being delivered
18:32:58 qmgr[4884]: 2FCB23E633: message is locked, deferring back to incoming queue. why?
18:32:58 qmgr[4884]: 2FCB23E633: deferring from active to incoming
18:32:58 qmgr[4884]: 2FCB23E633: moving from active -> incoming
18:33:57 qmgr[4884]: 2FCB23E633: moving from incoming -> active
18:33:57 qmgr[4884]: 2FCB23E633: skipped, still being delivered
18:33:57 qmgr[4884]: 2FCB23E633: message is locked, deferring back to incoming queue. why?
18:33:57 qmgr[4884]: 2FCB23E633: deferring from active to incoming
18:33:57 qmgr[4884]: 2FCB23E633: moving from active -> incoming
18:34:56 qmgr[4884]: 2FCB23E633: moving from incoming -> active
18:34:56 qmgr[4884]: 2FCB23E633: skipped, still being delivered
18:34:56 qmgr[4884]: 2FCB23E633: message is locked, deferring back to incoming queue. why?
18:34:56 qmgr[4884]: 2FCB23E633: deferring from active to incoming
18:34:56 qmgr[4884]: 2FCB23E633: moving from active -> incoming
18:35:55 qmgr[4884]: 2FCB23E633: moving from incoming -> active
18:35:55 qmgr[4884]: 2FCB23E633: skipped, still being delivered
18:35:55 qmgr[4884]: 2FCB23E633: message is locked, deferring back to incoming queue. why?
18:35:55 qmgr[4884]: 2FCB23E633: deferring from active to incoming
18:35:55 qmgr[4884]: 2FCB23E633: moving from active -> incoming
18:36:03 cleanup[1677]: CA37E2276B: message-id=<20011001222325.2FCB23E633cali-2.pobox.com>
18:36:19 smtp[2245]: 2FCB23E633: to=<knedrgrservicenetbest.com>, relay=growl.pobox.com[208.210.125.27], delay=756, status=sent (250 Ok: queued as CA37E2276B)
18:36:19 smtp[2245]: 2FCB23E633: communicating status 0 back to qmgr.
18:36:19 smtp[2245]: 2FCB23E633: communicated status back to qmgr with errorcode -1. responsibility ends.
18:36:20 qmgr[4884]: 2FCB23E633: moving from incoming -> active
18:36:20 qmgr[4884]: 2FCB23E633: from=<>, size=6640, nrcpt=1 (queue active)
18:36:20 qmgr[4884]: 2FCB23E633: deleting queue file under defer
18:36:20 qmgr[4884]: 2FCB23E633: assigning recipients to delivery requests and closing messagefile.
18:36:20 qmgr[4884]: 2FCB23E633: qmgr_active_done starting
18:36:20 qmgr[4884]: 2FCB23E633: deleting queue file under active
18:36:20 qmgr[4884]: 2FCB23E633: all done. removed.

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