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The .NET 8 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

Reuse the client or inject a shared HttpClient through its configuration in long-running applications. Dispose the SDK client when the application shuts down.

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Manage emails

Follow message states and delivery timelines.