chore: import upstream snapshot with attribution

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wehub-resource-sync
2026-07-13 13:12:17 +08:00
commit cf8edb9f21
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<header>Hosts/domains to hand off mail to on invalid destination </header>
<center><tt>fallback_relay</tt></center>
<hr>
This parameter specifies zero or more hosts or domains to hand off mail to if a
message destination is not found, or if a destination is unreachable.
<p>
By default, mail is bounced when a destination is not found, and delivery is
deferred if a destination is unreachable.
<hr>