During conversations that have lots of short messages, Conpherence sends lots of emails (even if the user has Phabricator open). I don't necessarily want to turn off email notifications for the Conpherence because I still want to get emails when people send messages after a period of inactivity, but during group conversations I don't want to get an email for every message.
Instead Conpherence should batch new messages together, based on the activity. I think something like this could be reasonable:
* After a period of frequent messages, send a summary 5 minutes after the first message started. This is so that if a conversation is happening, users will be notified that there's an active conversation happening and can then choose to participate in it.
* After a period of frequent messages followed by inactivity, send a summary email of the activity conversation that was had. This is so that users not participating in the conversation can read what happened via email later.