Summary:
Provide a base PhabricatorMailReplyHandler class which handles the plumbing for
multiplexing email if necessary and supporting public and private reply handler
addressses. DifferentialReplyHandler now extends it, and a new
ManiphestReplyHandler also does.
The general approach here is that we have three supported cases:
- no reply handler, default config, same as what we're doing now
- public reply handler, requires overriding classes but just sets "reply-to"
to some address the install generates and still sends only one email
- private reply handler, provides a default generation mechanism or you can
override it and splits mail apart so we send one to each recipient
Test Plan:
Sent email from Maniphest and Differential with and without
reply-handler-domains set.
Reviewed By: aran
Reviewers: jungejason, tuomaspelkonen, aran
CC: aran, epriestley
Differential Revision: 254
