Resend

Resend is a hosted email API for sending transactional and marketing email from applications. The homepage names REST and SMTP among its integration methods, and it lists SDKs for many languages. Its documentation describes the API as the email API for developers. The operator is Plus Five Five, Inc., which the privacy policy names. The company gives a San Francisco address.

Webhooks are offered, with the number of endpoints limited by plan. Single sign-on is an add-on on one plan and included on the top plan, and the pricing page says it works through the team’s identity provider. The homepage also names react-email, a separate open source component library for building email templates.

Worth knowing

Resend is offered only as a hosted service. Its security page states that stored data is held in the United States, and that the region chosen for a domain controls where email is sent from.