mail handling: When exceptions occur during account/rule/message handling, paperless will continue with the next account/rule/message.

mail handling: When paperless encounters a very long

fixes #82

src/paperless_mail/models.py

@@ -139,4 +139,4 @@ class MailRule(models.Model):
     )
 
     def __str__(self):
-        return self.name
+        return f"{self.account.name}.{self.name}"