diff --git a/mayordomo/__init__.py b/mayordomo/__init__.py
index 7cc9486..5670bac 100644
--- a/mayordomo/__init__.py
+++ b/mayordomo/__init__.py
@@ -132,7 +132,7 @@ async def enviarCorreosDominio(dominioid):
 						
 						if dkimKey is not None:							
 							mail2send = Parser(policy=default).parsestr(carta.contenido)						
-							signature = dkim.sign(carta.contenido, b'mayordomo', b'ilab.cl', dkimKey, include_headers=[b'from', b'to', b'subject', b'message-id']).decode()
+							signature = dkim.sign(carta.contenido.encode(), b'mayordomo', b'ilab.cl', dkimKey, include_headers=[b'from', b'to', b'subject', b'message-id']).decode()
 							
 							mail2send['DKIM-Signature'] = signature[len("DKIM-Signature: "):]