added email extension to allowed list type

backend/server.js

@@ -32,7 +32,7 @@ const CORS_ORIGINS = process.env.CORS_ORIGINS
 // Allowed file extensions for document uploads (documents only, no executables)
 const ALLOWED_EXTENSIONS = new Set([
     '.pdf', '.png', '.jpg', '.jpeg', '.gif', '.bmp', '.tiff', '.tif',
-    '.txt', '.csv', '.log',
+    '.txt', '.csv', '.log', '.msg', '.eml',
     '.doc', '.docx', '.xls', '.xlsx', '.ppt', '.pptx',
     '.odt', '.ods', '.odp',
     '.rtf', '.html', '.htm', '.xml', '.json', '.yaml', '.yml',
@@ -45,6 +45,7 @@ const ALLOWED_MIME_PREFIXES = [
     'application/msword', 'application/vnd.openxmlformats',
     'application/vnd.ms-', 'application/vnd.oasis.opendocument',
     'application/rtf', 'application/json', 'application/xml',
+    'application/vnd.ms-outlook', 'message/rfc822',
     'application/zip', 'application/gzip', 'application/x-7z',
     'application/x-tar', 'application/octet-stream'
 ];