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/tasks.py

@@ -1,14 +1,20 @@
 import logging
 
-from paperless_mail.mail import MailAccountHandler
+from paperless_mail.mail import MailAccountHandler, MailError
 from paperless_mail.models import MailAccount
 
 
 def process_mail_accounts():
     total_new_documents = 0
     for account in MailAccount.objects.all():
-        total_new_documents += MailAccountHandler().handle_mail_account(
-            account)
+        try:
+            total_new_documents += MailAccountHandler().handle_mail_account(
+                account)
+        except MailError as e:
+            logging.getLogger(__name__).error(
+                f"Error while processing mail account {account}: {e}",
+                exc_info=True
+            )
 
     if total_new_documents > 0:
         return f"Added {total_new_documents} document(s)."
@@ -21,4 +27,4 @@ def process_mail_account(name):
         account = MailAccount.objects.get(name=name)
         MailAccountHandler().handle_mail_account(account)
     except MailAccount.DoesNotExist:
-        logging.error("Unknown mail acccount: {}".format(name))
+        logging.getLogger(__name__).error(f"Unknown mail acccount: {name}")