diff --git a/src/steps/crm/akte/akte_sync_event_step.py b/src/steps/crm/akte/akte_sync_event_step.py
index e9f55ae..9ae0dc8 100644
--- a/src/steps/crm/akte/akte_sync_event_step.py
+++ b/src/steps/crm/akte/akte_sync_event_step.py
@@ -636,6 +636,20 @@ async def _run_ragflow_sync(
             if not mime_type:
                 mime_type = 'application/octet-stream'
 
+            # ── Dateityp-Filter: nur unterstützte MIME-Typen hochladen ──────────
+            is_eml = filename.lower().endswith('.eml') or mime_type == 'message/rfc822'
+            if not is_eml and mime_type not in RAGFlowService.SUPPORTED_MIME_TYPES:
+                ctx.logger.info(
+                    f"     ⏭️  Nicht unterstützter Dateityp ({mime_type}) – übersprungen"
+                )
+                if not ragflow_doc_id:
+                    await espocrm.update_entity('CDokumente', doc_id, {
+                        'aiSyncStatus': 'unsupported',
+                        'aiLastSync': datetime.now().strftime('%Y-%m-%d %H:%M:%S'),
+                    })
+                skipped += 1
+                continue
+
             try:
                 if ragflow_doc_id and not content_changed and meta_changed:
                     # ── Nur Metadaten aktualisieren ───────────────────────────