Add Support for Alternate Email Transports (#1580) #1939

Job	Run time
typecheck / typecheck	1m 58s
units / 🧪 Unit Tests	2m 4s
publish-webapp / publish	1m 58s
publish-worker / build (coordinator)	1m 32s
publish-worker / build (docker-provider)	1m 9s
publish-worker / build (kubernetes-provider)	55s
	9m 36s

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