Add Support for Alternate Email Transports #1950

Job	Run time
typecheck / typecheck	1m 34s
e2e / 🧪 CLI v3 tests (buildjet-8vcpu-ubuntu-2204 - npm)	1m 21s
e2e / 🧪 CLI v3 tests (buildjet-8vcpu-ubuntu-2204 - pnpm)	1m 24s
units / 🧪 Unit Tests	1m 17s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	4m 26s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	4m 32s
Preview Release	1m 52s
	16m 26s

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