Requirements and strategy for Core Mailer

Problem/Motivation

This issue is a companion to 🌱 Mailer module roadmap: the path to beta and stable Active . The road map is intended to be low-noise, with just regular updates about progress. This one is for detailed discussions.

The goal of this issue is to create specific and clearly defined issues that have majority/consensus support from the core group working on this area. Those issues can then be added to the road-map and assigned to individuals to work on.

Proposed resolution

Before we can create these specific issues, we will need to

1. Agree our requirements and scope
2. Decide upon the strategy/design: what are the main components such as services, interfaces, events

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet