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Phase 3 of the journaling spec.
- A journal's destination: builtIn (true for journals stored before) and
archiveAddress, at least one. Reports to an archive are queued from the
empty sender, one per address, flagged so they're never journaled.
- A pending record per report. When the queue lets go of one without
delivering it (refused, expired, deleted), it becomes its own entry in
the built-in journal under the sending journals' retention, the
journal's archiveFailures (count, last time, reason) goes up, and the
audit log records it; if that can't be written it stays queued.
- Journal it: a rule action naming a journal, on mail flow rules and
beside a DLP rule's block, warn or hold. A journal whose scope chooses
nobody takes only what rules send it.
- The report lists recipients a rule added or redirected to under
"Added by rule", by rule name.
- A rule's route is cleared between messages in one SMTP session, with the
new journal marks; a second message used to keep the first one's route.
tests/src/system/journal.rs: destination validation, a rule-only journal
fed by a rule that also adds a recipient, an unreachable archive's report
kept in the built-in journal with the failure counted, a report delivered
to an archive here and not journaled itself.