Free at resend.com/api-keys. It is stored in a cookie in this browser and never shared — anyone else opening this site uses their own.
The domain in your from address has to be added at resend.com/domains with its DNS records published. Without that, every provider will reject or spam-bin the mail — it is what proves you own the domain.
2 Your list
or paste below
Works with CSV, tab-separated (straight out of Excel), a plain list of addresses, or “Priya Nair <priya@example.com>” lines. Excel files: save as CSV first.
3 Your message
Personalize with {{FirstName}}, {{Name}}, {{Email}}, or any column header from your list.
Giving people a way out cuts spam complaints, which is what protects your domain.
4 Send
Your list never leaves your browser except as it is sent. Nothing is stored on the server.