Summary: Ref T7199. These were a bad idea which got copy-pasted a bunch. - There is zero reason to ever set these to different things. - Unsurprisingly, I don't know of any install which has them set to different things. Unless I've completely forgotten about it, this option was not motivated by some obscure business need, it was just a bad decision which didn't catch anyone's attention at the time. We partially remedied the mistake at some point by introducing `metamta.reply-handler-domain`, which works as a default for all applications, but never cleaned this mess up. Test Plan: Sent some mail from applications, verified it picked up appropraite reply handler domains. Reviewers: btrahan Reviewed By: btrahan Subscribers: epriestley Maniphest Tasks: T7199 Differential Revision: https://secure.phabricator.com/D12231