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One thing I should clarify about this: "email" doesn't mean it has to go through a third party hosted or publicly addressible self-hosted mailbox. It can even be completely local delivery.

The defining characteristic of being "email" is that it's sending to a common inbox that you can manage, transport, backup, search, etc. with software of your choice, not something locked within a particular app that the events were associated with, where you know the information is yours and immutable once it's delivered rather than at the whims of the producing process whether it will be available in the same unmodified form or at all in the future.