random cleanup from long ago

Summary: was doing some work in here and noticed this old crap lying around. T547 was last updated in December 2011 so I think its okay to delete these old mail hashes now.

Test Plan: careful code inspection, though I will be testing mail like whoa for the rest of the day probably

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T547

Differential Revision: https://secure.phabricator.com/D4650