[Bug 1230246] Re: Add Auto-Submitted header to email report

[Balint Reczey]

Tested with 1.1ubuntu1.18.04.7~16.04.2:

https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac
/autopkgtest-xenial/xenial/amd64/u/unattended-
upgrades/20190228_150449_11313@/log.gz

...
To: root at autopkgtest
Auto-Submitted: auto-generated
MIME-Version: 1.0
...

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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Title:
  Add Auto-Submitted header to email report

Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in unattended-upgrades source package in Xenial:
  Fix Committed

Bug description:
  Please add the header

    Auto-Submitted: auto-generated

  to the emails generated by the unattended-upgrade process. This would
  assist in both the mail filtering for receivers and the correct
  processing for "vacation" auto-responders.

  Further technical details are given in:

   http://tools.ietf.org/html/rfc3834#section-5
   http://tools.ietf.org/html/rfc5230#page-8
   https://www.iana.org/assignments/auto-submitted-keywords/auto-submitted-keywords.xhtml

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