Use CREATED_FROM_PARTNER flag

Author: acasajus

app/email_utils.py

@@ -74,7 +74,7 @@
 
 def get_noreply_address(user=None) -> str:
     """Full RFC 5322 formatted noreply address, e.g. '"SimpleLogin (noreply)" <noreply@sl.io>'"""
-    if user and PartnerUser.get_by(user_id=user.id):
+    if user and user.flags and User.flags & User.FLAG_CREATED_FROM_PARTNER > 0:
         return config.PARTNER_NOREPLY
     return config.NOREPLY