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The Kotlin JVM 21 SDK provides a coroutine-based class 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 SDK operations are suspending functions. Reuse one client for the lifetime of your service and close it during application shutdown.

Java

Use the Java 17 SDK.

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