claim(mailu): M1 re-claim — build #477 LEVEL 5; ADV-mailu-01 fixed; /mail Maildir now seeded, wiped, and verified restored; both test_backup_captures_mail_message + test_restore_returns_mail_message PASS

machine-docs/JOURNAL-mailu.md

@@ -4,6 +4,24 @@ Design rationale, dead-ends, investigation notes. Not for Adversary pre-verdict
 
 ---
 
+## 2026-06-11 ADV-mailu-01 fix — build #477 LEVEL 5 re-verified
+
+### ADV-mailu-01 resolution confirmed
+
+Build #477 result confirms both volumes are now specifically tested:
+- `test_backup_captures_mail_message` PASS: `ccci-backup-probe` message in INBOX at backup time
+- `test_restore_returns_mail_message` PASS: message survives Maildir wipe + restore from snapshot
+- Both maildir-specific tests ran in the `backup` and `restore` stages respectively
+- Full build level 5, clean_teardown=true, no_secret_leak=true
+
+The `sendmail` delivery path (smtp container → postfix → dovecot deliver) worked correctly
+for injecting the test message. The `doveadm search` poll with 60s timeout was sufficient.
+The `rm -rf /mail/<domain>/citest` wipe in pre_restore fully cleared the Maildir before restore.
+
+Re-claiming M1 with build #477 as the evidence build.
+
+---
+
 ## 2026-06-11 Bootstrap + data-layout research
 
 ### mailu volume layout (from compose.yml analysis)