We walk you through it.
Every step.

1

2

{
  "mcpServers": {
    "sendinel": {
      "type": "sse",
      "url": "https://sendinel.ai/api/mcp/sse",
      "headers": {
        "Authorization": "Bearer YOUR_API_KEY"
      }
    }
  }
}

3

Create your Sendinel account

Head to Sign up and create your account. It takes about 30 seconds - just an email and password. Once you're in, Sendinel will detect that you don't have a project set up yet and launch the setup wizard automatically. Don't skip it. The wizard is short and handles the heavy lifting for you.

Name your first sending site

A "site" in Sendinel is a sending identity — a from-name, a from-address, and a sending domain. Give it a name (e.g. "My SaaS") and fill in the from-address.

Using the shared domain (default, no setup): Leave the domain as mail.sendinel.ai. Your from-address will be yourname@mail.sendinel.ai. Zero DNS configuration. You're sending in under 5 minutes.

Using your own domain (optional, recommended for production): Enter your domain and follow the DNS steps. Sendinel shows you exactly what to add — or auto-configures it if you're on Cloudflare. Add your own domain any time after you've tested with the shared one.

Connect your app with the SDK

Install the Sendinel SDK and wire up two calls: identify when a user signs up, and track when they do something meaningful. That's how contacts flow into Sendinel and campaigns trigger automatically.

npm install @sendinel/sdk

// On user signup: await sendinel.identify(user.email, { firstName: user.name, siteId: 'your-site-uuid' }); // When they do something: await sendinel.track(user.email, 'completed_onboarding');

Your Sendinel API key is in Settings → API Keys. It starts with snk_. Contacts identified this way appear in your dashboard immediately.

Add your own sending domain (optional)

When you're ready to send from your own domain (e.g. hello@yourcompany.com), go to Settings → Sites → Edit and enter your domain. Sendinel walks you through the DNS records.

If you use Cloudflare: Enter your Cloudflare API token and Sendinel adds every record automatically. About 60 seconds.

Any other DNS provider: Sendinel shows you exactly which records to add — type, name, and value — copy-paste ready. Most providers propagate in under 10 minutes.

Once verified, update your site's from-address and your emails go out from your brand, not the shared domain.

DKIM, SPF, and DMARC are the three records that prove to inbox providers your email is legitimate. Sendinel sets all three up correctly — you just add what it generates to your DNS.

Import your first contacts (optional)

The wizard lets you upload a CSV to bring in existing contacts. If you don't have any yet - no problem. Skip this step and add contacts manually, or let them flow in later when you connect your app.

Sendinel maps your CSV columns automatically. First name, last name, email, tags - all recognized and imported cleanly.

On the Free plan you're capped at 250 contacts. Import your highest-value list first.

Send your first email

You're set up. Go to Campaigns → New Campaign, pick Broadcast (one-time send) or Sequence (multi-step drip), and write your first email - or let the AI draft it for you.

Hit send. Watch the open rate, click rate, and delivery metrics come in on your Overview page.

Ready to grow beyond the free limits? When you upgrade to BYOD, Sendinel moves your existing contacts and campaigns into your own database - you don't start over. The switch takes about 5 minutes using the Connector in Settings.