Comment 2 for bug 54152

The traceback I saw was:

Traceback (most recent call last):
  File "/srv/launchpad.net/launchpad/cronscripts/send-bug-notifications.py", line 77, in ?
    sys.exit(main())
  File "/srv/launchpad.net/launchpad/cronscripts/send-bug-notifications.py", line 58, in main
    sendmail(email)
  File "/srv/launchpad.net/launchpad/lib/canonical/launchpad/mail/sendmail.py",
line 219, in sendmail
    smtp.sendmail(config.bounce_address, to_addrs, raw_message)
  File "/usr/lib/python2.4/smtplib.py", line 695, in sendmail
    raise SMTPRecipientsRefused(senderrs)
smtplib.SMTPRecipientsRefused: {'<email address hidden>': (421, 'Unexpected failure, please try later')}

When looking at the problem manually, the mail was being rejected with the "421 Unexpected failure" message on "RCPT TO:". It wasn't related to dilys -- that was just the first address in the recipient list.