feat(PROJ-26): IMAP-Archive-Server Read-Only Zugriff auf archivierte Mails

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- Neues Package internal/imapserver: vollständiger IMAP4rev1-Server (~700 Zeilen)
- Auth via bcrypt (userstore.VerifyPassword), Multi-Tenant-Isolation
- INBOX + INBOX/LabelName Ordnerstruktur
- FETCH mit BODY[], ENVELOPE, RFC822.SIZE, INTERNALDATE, FLAGS, UID
- SEARCH: ALL, FROM, TO, SUBJECT, SINCE, BEFORE + UID FETCH/SEARCH
- Read-Only: STORE, DELETE, COPY, MOVE, APPEND → NO [CANNOT]
- \Seen-Flag nicht persistent (GoBD-konform)
- Max 5 gleichzeitige Verbindungen pro User, 30min Idle-Timeout
- Audit-Log: imap_login / imap_login_failed Events
- Config: imap_server.enabled + imap_server.bind (default: 127.0.0.1:1143)
- Externe Ports: 9993 (primär) und 993 (alternativ) via nginx TLS-Terminierung

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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sysops

2026-03-18 11:42:35 +01:00

parent 5c25e3a7e7

commit 19a55a3166

5 changed files with 1324 additions and 13 deletions

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internal/imapserver/server.go

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