diff options
| -rw-r--r-- | src/mailman/mta/base.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mailman/mta/base.py b/src/mailman/mta/base.py index a04ee4b46..679faefd5 100644 --- a/src/mailman/mta/base.py +++ b/src/mailman/mta/base.py @@ -63,9 +63,11 @@ class BaseDelivery: # Do the actual sending. sender = self._get_sender(mlist, msg, msgdata) message_id = msg['message-id'] + # Since the recipients can be a set or a list, sort the recipients by + # email address for predictability and testability. try: refused = self._connection.sendmail( - sender, recipients, msg.as_string()) + sender, sorted(recipients), msg.as_string()) except smtplib.SMTPRecipientsRefused as error: log.error('%s recipients refused: %s', message_id, error) refused = error.recipients |