diff --git a/apps/api/src/app.module.ts b/apps/api/src/app.module.ts
index 0a8e927..56b87bb 100644
--- a/apps/api/src/app.module.ts
+++ b/apps/api/src/app.module.ts
@@ -11,6 +11,7 @@ import { LdapModule } from './ldap/ldap.module';
 import { MailModule } from './mail/mail.module';
 import { CalendarModule } from './calendar/calendar.module';
 import { DashboardModule } from './dashboard/dashboard.module';
+import { DkvModule } from './dkv/dkv.module';
 import { DomaincheckModule } from './domaincheck/domaincheck.module';
 import { ModuleRegistryModule } from './module-registry/module-registry.module';
 import { PrismaModule } from './prisma/prisma.module';
@@ -35,6 +36,7 @@ import { UserModule } from './user/user.module';
     DashboardModule,
     CalendarModule,
     SettingsModule,
+    DkvModule,
   ],
   providers: [
     // Global JWT guard: all routes require auth unless @Public()
diff --git a/apps/api/src/dkv/dkv.module.ts b/apps/api/src/dkv/dkv.module.ts
new file mode 100644
index 0000000..60dd346
--- /dev/null
+++ b/apps/api/src/dkv/dkv.module.ts
@@ -0,0 +1,70 @@
+import { Logger, Module, OnModuleInit } from '@nestjs/common';
+import { ModuleRegistryModule } from '../module-registry/module-registry.module';
+import { ModuleRegistryService } from '../module-registry/module-registry.service';
+import { CalendarModule } from '../calendar/calendar.module';
+import { DkvController } from './dkv.controller';
+import { DkvExportService } from './dkv-export.service';
+import { DkvMailService } from './dkv-mail.service';
+import { DkvParserService } from './dkv-parser.service';
+import { DkvSchedulerService } from './dkv-scheduler.service';
+import { DkvService } from './dkv.service';
+import { ExchangeInboxProvider } from './providers/exchange-inbox.provider';
+import { ImapProvider } from './providers/imap.provider';
+import { seedDkvModule } from './dkv.seed';
+
+/**
+ * NestJS module for the DKV Fleet feature.
+ *
+ * Provides the full DKV processing pipeline:
+ * - DkvService: orchestration (poll → parse → export → send → history)
+ * - DkvSchedulerService: dynamic cron job via SchedulerRegistry
+ * - DkvParserService: pdf-parse v2 text extraction + DKV-specific regex
+ * - DkvExportService: xlsx buffer generation + user-files/ management
+ * - DkvMailService: nodemailer.createTransport() at send time
+ * - ImapProvider / ExchangeInboxProvider: inbox access providers
+ *
+ * Imports:
+ * - ModuleRegistryModule: for registry self-seed on init
+ * - CalendarModule: provides CalendarCryptoService (AES-256-GCM encryption)
+ *   re-exported from CalendarModule.exports — no re-declaration needed here.
+ *
+ * PrismaModule is global (no explicit import needed).
+ * ScheduleModule.forRoot() was registered in AppModule by Plan 01.
+ * SettingsModule (for DkvMailService → SettingsService) is imported in AppModule.
+ *
+ * Seeds itself into the module registry on application startup via
+ * OnModuleInit lifecycle hook — same pattern as DomaincheckModule.
+ */
+@Module({
+  imports: [
+    ModuleRegistryModule,
+    CalendarModule, // Provides CalendarCryptoService for inbox credential encryption
+  ],
+  controllers: [DkvController],
+  providers: [
+    DkvService,
+    DkvSchedulerService,
+    DkvParserService,
+    DkvExportService,
+    DkvMailService,
+    ImapProvider,
+    ExchangeInboxProvider,
+  ],
+  exports: [DkvService],
+})
+export class DkvModule implements OnModuleInit {
+  private readonly logger = new Logger(DkvModule.name);
+
+  constructor(
+    private readonly moduleRegistryService: ModuleRegistryService,
+  ) {}
+
+  async onModuleInit(): Promise<void> {
+    try {
+      await seedDkvModule(this.moduleRegistryService);
+      this.logger.log('DKV Fleet module seeded in registry');
+    } catch (error) {
+      this.logger.error('Failed to seed DKV Fleet module', error);
+    }
+  }
+}
diff --git a/apps/api/src/dkv/dkv.seed.ts b/apps/api/src/dkv/dkv.seed.ts
new file mode 100644
index 0000000..9d39f23
--- /dev/null
+++ b/apps/api/src/dkv/dkv.seed.ts
@@ -0,0 +1,26 @@
+import { ModuleRegistryService } from '../module-registry/module-registry.service';
+
+/**
+ * Seeds the DKV Fleet module into the module registry.
+ *
+ * Called during DkvModule initialization (OnModuleInit) to ensure
+ * the 'dkv-fleet' module record exists in the database.
+ *
+ * Category 'fleet' identifies this as a fleet-management module.
+ * isSystem: true — not tenant-licensable in v1; available to all tenants.
+ */
+export async function seedDkvModule(
+  moduleRegistryService: ModuleRegistryService,
+): Promise<void> {
+  await moduleRegistryService.seedModule({
+    slug: 'dkv-fleet',
+    name: 'DKV Flotte',
+    version: '1.0.0',
+    category: 'fleet',
+    description: {
+      de: 'DKV-Tankkartenrechnungen automatisch verarbeiten',
+      en: 'Automatically process DKV fuel card invoices',
+    },
+    isSystem: true,
+  });
+}
diff --git a/apps/web/src/messages/de.json b/apps/web/src/messages/de.json
index 917f6a9..ceac8e7 100644
--- a/apps/web/src/messages/de.json
+++ b/apps/web/src/messages/de.json
@@ -113,11 +113,25 @@
     "categoryDashboard": "Dashboard",
     "categoryWidgets": "Widgets",
     "categoryCalendar": "Kalender",
+    "categoryGeneral": "Allgemein",
+    "categorySmtp": "SMTP",
     "sourceDeleteConfirm": "Moechten Sie diese Kalenderquelle wirklich loeschen?",
     "sourceDeleteCta": "Quelle loeschen",
     "providerDeleteConfirm": "Moechten Sie diesen Suchanbieter wirklich loeschen?",
     "providerDeleteCta": "Anbieter loeschen",
-    "cancel": "Abbrechen"
+    "cancel": "Abbrechen",
+    "smtp": {
+      "title": "SMTP-Konfiguration",
+      "host": "Host",
+      "port": "Port",
+      "encryption": "Verschluesselung",
+      "username": "Benutzername",
+      "password": "Passwort",
+      "fromAddress": "Absenderadresse (Von)",
+      "fromAddressHelp": "Die E-Mail-Adresse, die als Absender angezeigt wird.",
+      "save": "Einstellungen speichern",
+      "test": "Verbindung testen"
+    }
   },
   "widgets": {
     "emptyHeading": "Keine Widgets aktiv",
@@ -237,6 +251,87 @@
     "checking": "Pruefe...",
     "error": "Fehler bei der Pruefung"
   },
+  "dkvFleet": {
+    "pageTitle": "DKV Flotte",
+    "checkNow": "Jetzt pruefen",
+    "checking": "Wird geprueft...",
+    "lastChecked": "Zuletzt geprueft: {time} Uhr",
+    "neverChecked": "Noch nie geprueft",
+    "settingsTitle": "Moduleinstellungen",
+    "historyTitle": "Verarbeitungshistorie",
+    "exportFilesTitle": "Letzte Exportdateien",
+    "emptyHistory": "Noch keine Rechnungen verarbeitet",
+    "emptyHistoryBody": "Klicke auf 'Jetzt pruefen', um den Posteingang zu pruefen. Neue Rechnungen erscheinen hier automatisch.",
+    "emptyExports": "Noch keine Exportdateien vorhanden",
+    "emptyVehicles": "Keine Fahrzeuge hinterlegt",
+    "emptyVehiclesBody": "Fuege Fahrzeuge manuell hinzu oder lade eine CSV-Datei hoch.",
+    "status": {
+      "processed": "Verarbeitet",
+      "error": "Fehler",
+      "sendFailed": "Versand fehlgeschlagen"
+    },
+    "col": {
+      "dateTime": "Datum/Zeit",
+      "invoiceNumber": "Rechnungsnummer",
+      "vehicles": "Fahrzeuge",
+      "transactions": "Transaktionen",
+      "status": "Status",
+      "exportFile": "Exportdatei",
+      "licensePlate": "Kennzeichen",
+      "brand": "Marke",
+      "model": "Modell",
+      "driver": "Fahrer",
+      "actions": "Aktionen"
+    },
+    "addVehicle": "Fahrzeug hinzufuegen",
+    "editVehicle": "Fahrzeug bearbeiten",
+    "deleteVehicle": "Fahrzeug loeschen",
+    "deleteVehicleBody": "Das Fahrzeug {plate} wird dauerhaft aus der Stammdatenliste entfernt. Diese Aktion kann nicht rueckgaengig gemacht werden.",
+    "importCsv": "CSV importieren",
+    "importMode": "Importmodus",
+    "importMerge": "Zusammenfuehren — neue Fahrzeuge hinzufuegen, vorhandene behalten",
+    "importReplace": "Ersetzen — alle vorhandenen Fahrzeuge loeschen und neu importieren",
+    "importReplaceWarning": "Alle vorhandenen Fahrzeuge werden ersetzt.",
+    "importReplaceConfirmTitle": "Fahrzeuge ersetzen?",
+    "importReplaceConfirmBody": "Alle vorhandenen Fahrzeuge werden durch die CSV-Daten ersetzt. Diese Aktion kann nicht rueckgaengig gemacht werden.",
+    "importReplaceConfirmButton": "Ersetzen",
+    "importSuccess": "{count} Fahrzeuge importiert",
+    "vehicleCount": "{count} Fahrzeuge",
+    "tabs": {
+      "inbox": "Posteingang",
+      "vehicles": "Fahrzeuge"
+    },
+    "form": {
+      "protocol": "Protokoll",
+      "host": "Host",
+      "port": "Port",
+      "encryption": "Verschluesselung",
+      "encryptionNone": "Keine",
+      "folder": "Ordner",
+      "senderFilter": "Absenderfilter",
+      "pollInterval": "Abrufintervall",
+      "pollIntervalSuffix": "Minuten",
+      "username": "Benutzername",
+      "password": "Passwort",
+      "exportRecipient": "Export-Empfaenger",
+      "vehicleFormat": "Fahrzeug-Formatstring",
+      "vehicleFormatHelp": "Verfuegbare Platzhalter: {Marke}, {Modell}, {Kennzeichen}, {Fahrer}",
+      "active": "Aktiv",
+      "testConnection": "Verbindung testen",
+      "testTesting": "Verbindung wird getestet...",
+      "testSuccess": "Verbindung erfolgreich",
+      "testFailed": "Verbindung fehlgeschlagen: {error}",
+      "save": "Einstellungen speichern",
+      "cancel": "Bearbeitung abbrechen",
+      "cancelDialog": "Abbrechen",
+      "showPassword": "Passwort anzeigen",
+      "hidePassword": "Passwort verbergen"
+    },
+    "errors": {
+      "pollFailed": "Posteingang konnte nicht geprueft werden. Ueberpruefe die Konfiguration unter 'Moduleinstellungen > Posteingang'.",
+      "smtpFailed": "Export wurde erstellt, konnte aber nicht gesendet werden. Die Datei ist weiterhin zum Download verfuegbar."
+    }
+  },
   "marketplace": {
     "title": "Marktplatz",
     "subtitle": "Entdecken und aktivieren Sie Module fuer Ihren Mandanten",
diff --git a/apps/web/src/messages/en.json b/apps/web/src/messages/en.json
index 112cd3b..db617de 100644
--- a/apps/web/src/messages/en.json
+++ b/apps/web/src/messages/en.json
@@ -113,11 +113,25 @@
     "categoryDashboard": "Dashboard",
     "categoryWidgets": "Widgets",
     "categoryCalendar": "Calendar",
+    "categoryGeneral": "General",
+    "categorySmtp": "SMTP",
     "sourceDeleteConfirm": "Are you sure you want to delete this calendar source?",
     "sourceDeleteCta": "Delete source",
     "providerDeleteConfirm": "Are you sure you want to delete this search provider?",
     "providerDeleteCta": "Delete provider",
-    "cancel": "Cancel"
+    "cancel": "Cancel",
+    "smtp": {
+      "title": "SMTP Configuration",
+      "host": "Host",
+      "port": "Port",
+      "encryption": "Encryption",
+      "username": "Username",
+      "password": "Password",
+      "fromAddress": "Sender Address (From)",
+      "fromAddressHelp": "The email address shown as the sender.",
+      "save": "Save Settings",
+      "test": "Test Connection"
+    }
   },
   "widgets": {
     "emptyHeading": "No active widgets",
@@ -237,6 +251,87 @@
     "checking": "Checking...",
     "error": "Error checking domain"
   },
+  "dkvFleet": {
+    "pageTitle": "DKV Fleet",
+    "checkNow": "Check Now",
+    "checking": "Checking...",
+    "lastChecked": "Last checked: {time}",
+    "neverChecked": "Never checked",
+    "settingsTitle": "Module Settings",
+    "historyTitle": "Processing History",
+    "exportFilesTitle": "Recent Export Files",
+    "emptyHistory": "No invoices processed yet",
+    "emptyHistoryBody": "Click 'Check Now' to poll the inbox. New invoices will appear here automatically.",
+    "emptyExports": "No export files available yet",
+    "emptyVehicles": "No vehicles configured",
+    "emptyVehiclesBody": "Add vehicles manually or upload a CSV file.",
+    "status": {
+      "processed": "Processed",
+      "error": "Error",
+      "sendFailed": "Send Failed"
+    },
+    "col": {
+      "dateTime": "Date/Time",
+      "invoiceNumber": "Invoice Number",
+      "vehicles": "Vehicles",
+      "transactions": "Transactions",
+      "status": "Status",
+      "exportFile": "Export File",
+      "licensePlate": "License Plate",
+      "brand": "Make",
+      "model": "Model",
+      "driver": "Driver",
+      "actions": "Actions"
+    },
+    "addVehicle": "Add Vehicle",
+    "editVehicle": "Edit Vehicle",
+    "deleteVehicle": "Delete Vehicle",
+    "deleteVehicleBody": "Vehicle {plate} will be permanently removed from the master list. This action cannot be undone.",
+    "importCsv": "Import CSV",
+    "importMode": "Import Mode",
+    "importMerge": "Merge — add new vehicles, keep existing",
+    "importReplace": "Replace — delete all existing vehicles and re-import",
+    "importReplaceWarning": "All existing vehicles will be replaced.",
+    "importReplaceConfirmTitle": "Replace Vehicles?",
+    "importReplaceConfirmBody": "All existing vehicles will be replaced with the CSV data. This action cannot be undone.",
+    "importReplaceConfirmButton": "Replace",
+    "importSuccess": "{count} vehicles imported",
+    "vehicleCount": "{count} vehicles",
+    "tabs": {
+      "inbox": "Inbox",
+      "vehicles": "Vehicles"
+    },
+    "form": {
+      "protocol": "Protocol",
+      "host": "Host",
+      "port": "Port",
+      "encryption": "Encryption",
+      "encryptionNone": "None",
+      "folder": "Folder",
+      "senderFilter": "Sender Filter",
+      "pollInterval": "Poll Interval",
+      "pollIntervalSuffix": "Minutes",
+      "username": "Username",
+      "password": "Password",
+      "exportRecipient": "Export Recipient",
+      "vehicleFormat": "Vehicle Format String",
+      "vehicleFormatHelp": "Available placeholders: {Marke}, {Modell}, {Kennzeichen}, {Fahrer}",
+      "active": "Active",
+      "testConnection": "Test Connection",
+      "testTesting": "Testing connection...",
+      "testSuccess": "Connection successful",
+      "testFailed": "Connection failed: {error}",
+      "save": "Save Settings",
+      "cancel": "Cancel Editing",
+      "cancelDialog": "Cancel",
+      "showPassword": "Show password",
+      "hidePassword": "Hide password"
+    },
+    "errors": {
+      "pollFailed": "Could not check inbox. Review the configuration under 'Module Settings > Inbox'.",
+      "smtpFailed": "Export was created but could not be sent. The file is still available for manual download."
+    }
+  },
   "marketplace": {
     "title": "Marketplace",
     "subtitle": "Discover and activate modules for your tenant",