Getting started | Resent

Get your API key

Generate an API key from your Resent account. You’ll need it to authenticate every request — copy it immediately, it’s only shown once.

Open API key settings →

In the API keys tab, click Generate a new API key, name it, and save it somewhere secure.

Whitelist your IP address

The playground runs from your browser, so Resent needs to recognize your current IP before processing requests from it.

Your current IP address is:

Detecting…

Add it to the Authorized IPs list in IP whitelisting.

Open IP whitelisting →

Prefer to skip this step? Send your first request anyway. If your IP isn’t whitelisted, Resent sends a security email with a one-click authorization link — then come back and retry.

Not required when calling the API from a server or CLI.

Send your first request

Enter your API key in the Authorization header in the panel on the right, then click Send request.

A 200 response with your account details confirms your key is valid — you’re ready to build.

What’s next

Authentication — Bearer API key auth and required headers
Send transactional emails — send your first message
Add a domain — verify SPF/DKIM before mailing third parties
Setup webhooks — receive delivery, open, and WhatsApp events
Rate limits — understand quotas and 429 handling

Tools and resources

Dashboard

Create keys, verify domains, and send from the Resent dashboard.

API Rate limits

Optimize for throughput and handle rate-limit responses.

MCP Server

Integrate Resent docs with AI assistants via Model Context Protocol.