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Re:Launch HN: Plum Mail (YC S20) – Email alternative for gro... by WiF3cap7ShUth4 on Friday August 21, 2020 @03:55PM (#24238299)
Look like "The messenger - Delta Chat".
Re:Launch HN: Plum Mail (YC S20) – Email alternative for gro... by richardesigns on Friday August 21, 2020 @04:05PM (#24238382)
Similar in that you can contact anyone with their email address without that person needing to 'sign up'. This openess is important.

The format in Plum Mail is more longform rather than chat as such. Delta Chat is a cool service.