diff --git a/backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java b/backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java
index ae846f19..19f44ab5 100644
--- a/backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java
+++ b/backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java
@@ -7,9 +7,11 @@ import org.raddatz.familienarchiv.dto.OcrStatusDTO;
 import org.raddatz.familienarchiv.dto.TrainingHistoryResponse;
 import org.raddatz.familienarchiv.dto.TrainingInfoResponse;
 import org.raddatz.familienarchiv.dto.TriggerOcrDTO;
+import org.raddatz.familienarchiv.dto.TriggerSenderTrainingDTO;
 import org.raddatz.familienarchiv.model.AppUser;
 import org.raddatz.familienarchiv.model.OcrJob;
 import org.raddatz.familienarchiv.model.OcrTrainingRun;
+import org.raddatz.familienarchiv.model.TrainingStatus;
 import org.raddatz.familienarchiv.security.Permission;
 import org.raddatz.familienarchiv.security.RequirePermission;
 import org.raddatz.familienarchiv.service.OcrBatchService;
@@ -17,6 +19,7 @@ import org.raddatz.familienarchiv.service.OcrProgressService;
 import org.raddatz.familienarchiv.service.OcrService;
 import org.raddatz.familienarchiv.service.OcrTrainingService;
 import org.raddatz.familienarchiv.service.SegmentationTrainingExportService;
+import org.raddatz.familienarchiv.service.SenderModelService;
 import org.raddatz.familienarchiv.service.TrainingDataExportService;
 import org.raddatz.familienarchiv.service.UserService;
 import org.springframework.http.HttpHeaders;
@@ -44,6 +47,7 @@ public class OcrController {
     private final TrainingDataExportService trainingDataExportService;
     private final SegmentationTrainingExportService segmentationTrainingExportService;
     private final OcrTrainingService ocrTrainingService;
+    private final SenderModelService senderModelService;
 
     @PostMapping("/api/documents/{documentId}/ocr")
     @ResponseStatus(HttpStatus.ACCEPTED)
@@ -148,6 +152,17 @@ public class OcrController {
         return ocrTrainingService.getSenderTrainingHistory(personId);
     }
 
+    @PostMapping("/api/ocr/train-sender")
+    @ResponseStatus(HttpStatus.ACCEPTED)
+    @RequirePermission(Permission.ADMIN)
+    public OcrTrainingRun triggerSenderTraining(@RequestBody TriggerSenderTrainingDTO dto) {
+        OcrTrainingRun run = senderModelService.triggerManualSenderTraining(dto.personId());
+        if (run.getStatus() == TrainingStatus.RUNNING) {
+            senderModelService.runSenderTraining(dto.personId());
+        }
+        return run;
+    }
+
     private UUID resolveUserId(Authentication authentication) {
         if (authentication == null || !authentication.isAuthenticated()) return null;
         try {
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/dto/TriggerSenderTrainingDTO.java b/backend/src/main/java/org/raddatz/familienarchiv/dto/TriggerSenderTrainingDTO.java
new file mode 100644
index 00000000..baa8d0f3
--- /dev/null
+++ b/backend/src/main/java/org/raddatz/familienarchiv/dto/TriggerSenderTrainingDTO.java
@@ -0,0 +1,5 @@
+package org.raddatz.familienarchiv.dto;
+
+import java.util.UUID;
+
+public record TriggerSenderTrainingDTO(UUID personId) {}
diff --git a/backend/src/main/java/org/raddatz/familienarchiv/service/SenderModelService.java b/backend/src/main/java/org/raddatz/familienarchiv/service/SenderModelService.java
index 69114b4d..4bcd5df0 100644
--- a/backend/src/main/java/org/raddatz/familienarchiv/service/SenderModelService.java
+++ b/backend/src/main/java/org/raddatz/familienarchiv/service/SenderModelService.java
@@ -33,6 +33,7 @@ public class SenderModelService {
     private final OcrClient ocrClient;
     private final TransactionTemplate txTemplate;
     private final TrainingDataExportService trainingDataExportService;
+    private final PersonService personService;
 
     @Value("${ocr.sender-model.activation-threshold:100}")
     private int activationThreshold;
@@ -50,6 +51,22 @@ public class SenderModelService {
         return senderModelRepository.findAll();
     }
 
+    public OcrTrainingRun triggerManualSenderTraining(UUID personId) {
+        personService.getById(personId);
+        long correctedLines = blockRepository.countManualKurrentBlocksByPerson(personId);
+        boolean runNow = runOrQueueSenderTraining(personId, (int) correctedLines);
+        TrainingStatus targetStatus = runNow ? TrainingStatus.RUNNING : TrainingStatus.QUEUED;
+        return trainingRunRepository.findFirstByPersonIdAndStatus(personId, targetStatus)
+                .orElseThrow(() -> new IllegalStateException(
+                        "Expected " + targetStatus + " row for person " + personId));
+    }
+
+    @Async
+    public void runSenderTraining(UUID personId) {
+        long correctedLines = blockRepository.countManualKurrentBlocksByPerson(personId);
+        triggerSenderTraining(personId, (int) correctedLines);
+    }
+
     /**
      * Called after every MANUAL block save for HANDWRITING_KURRENT documents.
      * Checks activation and retrain thresholds; enqueues or starts sender training when met.
diff --git a/backend/src/test/java/org/raddatz/familienarchiv/service/SenderModelServiceTest.java b/backend/src/test/java/org/raddatz/familienarchiv/service/SenderModelServiceTest.java
index 57318758..f4ae5f2d 100644
--- a/backend/src/test/java/org/raddatz/familienarchiv/service/SenderModelServiceTest.java
+++ b/backend/src/test/java/org/raddatz/familienarchiv/service/SenderModelServiceTest.java
@@ -10,6 +10,7 @@ import org.raddatz.familienarchiv.model.TrainingStatus;
 import org.raddatz.familienarchiv.repository.OcrTrainingRunRepository;
 import org.raddatz.familienarchiv.repository.SenderModelRepository;
 import org.raddatz.familienarchiv.repository.TranscriptionBlockRepository;
+import org.raddatz.familienarchiv.model.Person;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.transaction.support.TransactionCallback;
 import org.springframework.transaction.support.TransactionTemplate;
@@ -30,6 +31,7 @@ class SenderModelServiceTest {
     OcrClient ocrClient;
     TransactionTemplate txTemplate;
     TrainingDataExportService trainingDataExportService;
+    PersonService personService;
     SenderModelService service;
 
     UUID personId = UUID.randomUUID();
@@ -42,6 +44,7 @@ class SenderModelServiceTest {
         ocrClient = mock(OcrClient.class);
         txTemplate = mock(TransactionTemplate.class);
         trainingDataExportService = mock(TrainingDataExportService.class);
+        personService = mock(PersonService.class);
 
         // Execute transaction callbacks inline so unit tests run without a real DataSource.
         // lenient: not every test hits the txTemplate path, but the setup is shared.
@@ -51,7 +54,7 @@ class SenderModelServiceTest {
         });
 
         service = new SenderModelService(senderModelRepository, blockRepository,
-                trainingRunRepository, ocrClient, txTemplate, trainingDataExportService);
+                trainingRunRepository, ocrClient, txTemplate, trainingDataExportService, personService);
         ReflectionTestUtils.setField(service, "activationThreshold", 100);
         ReflectionTestUtils.setField(service, "retrainDelta", 50);
     }