[Blueprint servercloud-p-postfix-enhancements] Postfix package improvements

[Clint Byrum]

Blueprint changed by Clint Byrum:

Whiteboard changed:
  Work Items:
  [lamont]  multinstance support: DONE
  [clint-fewbar]  upstart documentation: TODO
  [clint-fewbar]  apport pattern for invalid hostname: DONE
  [lamont]  not preseedable - investigate if this is fixable and document it either way: TODO
  [lamont]  sqlite support: TODO
- [clint-fewbar]  No backscatter by default on new install - investigate: TODO
+ [clint-fewbar]  No backscatter by default on new install - investigate: POSTPONED
  [dannf]  - unchroot script: TODO
  [ivoks]  - mail stack deployments via puppet, etc.: TODO
  [kitterman]  clean up deprecated packaging changes: DONE

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Postfix package improvements
https://blueprints.launchpad.net/ubuntu/+spec/servercloud-p-postfix-enhancements