> Instead I went with MQTT for the latest project that collected telemetry data ...
If you want broadcast-message-to-topic-subscribers style semantics, you could have [ab]used IRC for this, rather than SMTP :-P
If you want broadcast-message-to-topic-subscribers style semantics, you could have [ab]used IRC for this, rather than SMTP :-P
[1] If you lose connection, neither side is sure which messages they missed, and replaying is not part of the protocol. If you're gonna support a memo bot, why not build it in?