diff --git a/django_mailbox/models.py b/django_mailbox/models.py
index f868b4a..b7d13aa 100644
--- a/django_mailbox/models.py
+++ b/django_mailbox/models.py
@@ -384,6 +384,8 @@ class Mailbox(models.Model):
             msg.timestamp = parser.parse(message["date"])
         elif "Date" in message:
             msg.timestamp = parser.parse(message["Date"])
+        else:
+            msg.timestamp = now()
 
 
         if Message.objects.filter(message_id=msg.message_id).count() != 0: