Journaling: outside archives, and Journal it in mail flow rules

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.

crates/smtp/src/inbound/data.rs

@@ -763,19 +763,27 @@ impl<T: SessionStream> Session<T> {
         }
         for change in envelope {
             match change {
-                super::mailflow::EnvelopeChange::AddRecipient(address) => {
+                super::mailflow::EnvelopeChange::AddRecipient(address, rule) => {
                     if !self
                         .data
                         .rcpt_to
                         .iter()
                         .any(|r| r.address_lcase.eq_ignore_ascii_case(&address))
                     {
+                        self.data.journal_added.push((address.to_lowercase(), rule));
                         self.data.rcpt_to.push(SessionAddress::new(address));
                     }
                 }
-                super::mailflow::EnvelopeChange::Redirect(addresses) => {
+                super::mailflow::EnvelopeChange::Redirect(addresses, rule) => {
+                    self.data.journal_added = addresses
+                        .iter()
+                        .map(|a| (a.to_lowercase(), rule.clone()))
+                        .collect();
                     self.data.rcpt_to = addresses.into_iter().map(SessionAddress::new).collect();
                 }
+                super::mailflow::EnvelopeChange::Journal(journal) => {
+                    self.data.journal_marks.push(journal);
+                }
                 super::mailflow::EnvelopeChange::Route(queue) => {
                     self.data.mailflow_queue = Some(queue);
                 }
@@ -882,7 +890,11 @@ impl<T: SessionStream> Session<T> {
                         .with_dkim_signers(dkim_signers)
                         .with_original_raw_message(original_message)
                         .with_original_authenticated_message(auth_message)
-                        .with_metadata(metadata),
+                        .with_metadata(metadata)
+                        .with_journal(
+                            std::mem::take(&mut self.data.journal_marks),
+                            std::mem::take(&mut self.data.journal_added),
+                        ),
                 )
                 .await
             {