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Per-source preferred SMTP account (#60). A source can be pinned to one SMTP account; a send uses it while the account is enabled and under quota, and otherwise falls back to round-robin, so a preference never blocks or delays a send.
Plugins can label each of their emails as a distinct source (#62, #63). An X-TMQ-Source-Key header, with an optional X-TMQ-Source-Label, overrides detection for plugin:, mu_plugin: and theme: keys. Both headers are stripped before the message is stored or sent.