R1:83f5452d538d

Implement all remaining config options

Summary: Resolves T2255.

Test Plan: Looked at mail options. Saw no remaining "Setup Issues".

Reviewers: codeblock, btrahan

Reviewed By: codeblock

CC: aran

Maniphest Tasks: T2255

Differential Revision: https://secure.phabricator.com/D4477