R1:3f91559b8a01

fix mail handler for conpherence try 2

Summary: the editor methods are protected so just build a reply handler directly

Test Plan: push it live and try again

Reviewers: epriestley, chad

Reviewed By: chad

CC: aran, Korvin

Maniphest Tasks: T2399

Differential Revision: https://secure.phabricator.com/D4670