By design, all Postfix programs can fail, and therefore must retry.
If the cleanup daemon fails, the pickup daemon must retry. Likewise,
if a delivery agent or bounce daemon fails, the queue manager must
retry. Also, queue files may be moved around with postsuper or
postqueue.

If a queue rescan doesn't happen, then mail can appear to be stuck
in the queue.

Wakeups ensure that Postfix is reliable. I could delete most of the
Postfix code if it never fails, but that would make it less reliable.

Suggesting that these programs are running continuously is not fair.
Instead, they sleep. If the file system activity bothers you then
somene could add a few stat() calls and skip directories that have
no recently modified time stamp.

        Wietse
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