[Bug 850360] [NEW] [requestsync] Traceback instead of retry for 4xx response

[Scott Kitterman]

Public bug reported:

When delivering by mail, if the message is deferred, requestsync should
wait and retry the message rather than crash:


Press [Enter] to continue or [Ctrl-C] to abort. 
Connecting to mx.launchpad.net:25 ...
Traceback (most recent call last):
  File "/usr/bin/requestsync", line 328, in <module>
    main()
  File "/usr/bin/requestsync", line 325, in main
    mailserver_user, mailserver_pass)
  File "/usr/lib/python2.7/dist-packages/ubuntutools/requestsync/mail.py", line 144, in mailBug
    s = smtplib.SMTP(mailserver_host, mailserver_port)
  File "/usr/lib/python2.7/smtplib.py", line 241, in __init__
    raise SMTPConnectError(code, msg)
smtplib.SMTPConnectError: (421, 'Too many concurrent SMTP connections; please try again later.')

** Affects: ubuntu-dev-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/850360

Title:
  [requestsync] Traceback instead of retry for 4xx response

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