Resend

Resend is an email platform with APIs and SDKs for sending email from applications. It supports verified sending domains, email activity inspection and webhooks for events such as delivery outcomes, so an app can react to what happens after a send request.

Editorial assessment of the documented product. This review does not include personal testing notes or benchmark results.

I'd begin with the emails that people depend on: sign-in links, receipts and important account updates. Keep the templates readable on a phone and give each message one obvious purpose. The API is only one part of getting that experience right.

The operational details deserve attention early. Verify the sending domain, choose an appropriate subdomain and connect the events you need to observe. I'd want the application to distinguish a successfully accepted send request from the later delivery outcome.

I also would not read a clean API response as a promise of inbox placement. Sender reputation, recipient systems and the message itself still matter. Handle failed sends and repeated events carefully, and test the complete user flow rather than only confirming that a sample email arrived once.