- passwd.j2: append '::::::' so entries have full 8-field passwd format.
Without this Dovecot's userdb lookup fails ('user is missing userdb
info') even though passdb auth succeeds, causing login to return 401.
- main.yml: fix passwd file mode from 0640 to 0644 so Dovecot can read it.
- Add runbook-mail-import.md: full procedure for migrating mbox-format mail
(old Dovecot server with ~/mail/ flat files) to Maildir++ including the
conversion script that handles fetchmail >From envelope lines.
- runbook-configuration.md: reference new runbook in the mail import section.
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