The design questions were closed with the owner on 2026-10-12, one at a
time; the plan records what he chose and what I had proposed instead.
- The rule: From: is held to what the envelope is held to - any address of
the application's domain, or the addresses of its list. Anything else is
refused, a domain this server knows nothing of included (I had proposed
to refuse only names the server signs for).
- The check is the panel's and strict: while the panel does not answer,
Postfix defers mail. It gets a socket of its own so that the journal
stays fail-open, and reads Postfix's own file of sender bindings.
- Server > Health counts the panel's downtime under a running Postfix and
the mail deferred for it, to decide later whether the check needs a
process of its own.
- A refusal is 550 5.7.1, and its reason is the row's status tag.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
