diff --git a/django_mailbox/models.py b/django_mailbox/models.py
index f99111b..5af0b7c 100755
--- a/django_mailbox/models.py
+++ b/django_mailbox/models.py
@@ -252,7 +252,7 @@ class Message(models.Model):
         pre-set it.
 
         """
-        if self.mailbox.from_email
+        if self.mailbox.from_email:
             message.from_email = self.mailbox.from_email
         else:
             message.from_email = settings.DEFAULT_FROM_EMAIL