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The Rust SDK provides an async class-based client and uses https://api.signal.apollodeploy.com by default. Before you start, create an API key with Emails: Send permission and verify the From domain.
1

Install the SDK

2

Store your API key

Set SIGNAL_API_KEY in the server environment or secret manager.
3

Send an email

The generated request type keeps optional fields explicit. Add an idempotency_key when a worker may retry the same logical send.

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Compare every supported language and framework.

Manage emails

Follow message states and delivery timelines.