Helo
An email API and SMTP service built for applications and platforms.
An email API with tools for building and monitoring delivery.

Resend supplies email APIs for the messages an application sends to its users, alongside tools for marketing broadcasts. Developers connect through SDKs, REST, or SMTP and build templates with HTML or React Email components. A test mode simulates email events while an integration is being developed.
Webhooks report delivery, bounces, opens, and clicks to the application's own systems. For newsletters and campaigns, an editor, audience records, and broadcast reporting cover the content and recipient list as well as the send. A team can use the API for transactional messages and the visual tools for recurring communication, with event records available when a message needs investigation.
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