diff --git a/PROGRESS.md b/PROGRESS.md
index 6babf11..217eb0a 100644
--- a/PROGRESS.md
+++ b/PROGRESS.md
@@ -624,3 +624,28 @@ LeoCRM-Agenten können externe MCP-Server nutzen (Web-Search, Code-Execution, ex
 
 **Phase 5 Batch 6b Gesamt: ✅ Complete**
 **Phase 5 Gesamt: ✅ Complete**
+
+---
+
+## Phase 6: React Hook Form + Zod überall
+
+| Task | Status | Datum | Notiz |
+|---|---|---|---|
+| 6.1 | ✅ done | 2026-07-24 | ComposeModal auf RHF + Zod: email list validation (to/cc/bcc), subject required, body via setValue. 4 validation tests. |
+| 6.2 | ✅ done | 2026-07-24 | AppointmentModal auf RHF + Zod: title/calendar_id required, start<end date validation via superRefine. 3 validation tests. |
+| 6.3 | ✅ done | 2026-07-24 | SettingsForms auf RHF + Zod: Currencies (code/name/symbol), Taxes (name/rate/country), Sequences (name/padding), Users (name/email/password), Roles (name), Groups (name/description). 2 validation tests. |
+| 6.4 | ✅ done | 2026-07-24 | DMS-Forms auf RHF + Zod: Dms.tsx folder-create (name required), ShareDialog add-share (shareId required). 2 validation tests. |
+| 6.5 | ✅ done | 2026-07-24 | Tag-Forms auf RHF + Zod: TagPicker create-tag (name required, color optional). 2 validation tests. |
+| 6.6 | ✅ done | 2026-07-24 | Mail-Settings-Forms auf RHF + Zod: MailSettings account form (email/imap/smtp/password), SignatureManager (name), RuleEditor (name/priority), LabelManager (name/color), VacationResponder (enabled/dates/subject/body). 2 validation tests. |
+
+### Verifikation Phase 6
+- TSC: 0 neue Errors (nur pre-existing Dms.tsx onRangeSelect errors — 2 total)
+- 6 Commits mit klaren Messages (Phase 6.1 bis 6.6)
+- 15 neue Validation Tests (alle passing)
+- Bestehende Funktionalität erhalten — nur Form-Handling geändert
+- react-hook-form + zod + @hookform/resolvers/zod verwendet
+- Error-Display: rote Text unter jedem Feld mit Fehler
+- i18n für Fehlermeldungen (validation.required, validation.email, etc.)
+- Bereits migrierte Forms (Login, PasswordReset, SettingsSystem, ContactEditModal) nicht geändert
+
+**Phase 6 Gesamt: ✅ Complete**