Jim Seymour via Postfix-users:
> Hi All,
> 
> While refactoring pflogsumm, and regression-testing the pre- and
> post-refactor code against a corpus of Postfix log samples (21 files,
> ~455k lines), two differences traced back to lines like the following
> (edited to use example addresses/IPs):
> 
>     Jan  1 12:10:48 hostname postfix/qmgr[10922]: 739A2783CBA:
>      to=<[email protected]>, orig_to=<[email protected]>,
>      relay=none, delay=76608, status=deferred (delivery temporarily
>      suspended: connect to hostname.example.com[192.0.2.1]:
>      Connection timed out)

When a destination has "enough" consecutive delivery failures,
further delivery attempts would be wasteful, like flogging a dead
horse. Instead, the scheduler puts the destination to a temporary 
'dead' list and avoids further delivery attempts.

See: 
https://www.postfix.org/SCHEDULER_README.html#dead_summary_2_5

        Wietse
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