Deliver transactional and marketing emails for free. Open source email sending platform with SMTP relay, REST API, and real-time delivery tracking.
Trusted by developers and teams worldwide
1text"text-emerald-400">-emerald-400">curl text-emerald-400">-X POST text-blue-400">https://api.freemailsend.dev/api/emails/send \ 2 text-emerald-400">-H "Content"text-emerald-400">-Type: application/json" \ 3 text-emerald-400">-H "x"text-emerald-400">-api"text-emerald-400">-key: fms_YOUR_API_KEY" \ 4 text-emerald-400">-d '{ 5 "from": "hello@yourdomain.com", 6 "to": ["user@example.com"], 7 "subject": "Welcome aboard!", 8 "html": "Hello!
Your account is ready.
" 9 }'Replace fms_YOUR_API_KEY with your actual API key from the dashboard
Hi Alex,
Your account is all set up. You can now send emails using our simple REST API or connect your own SMTP server.
Happy sending! 🚀
A clean REST API that speaks your language. One curl command and your email is on its way.
1curl -X POST https://api.freemailsend.dev/send \\ 2 -H ""x-api-key: fms_abc123..."" \ 3 -H ""Content-Type: application/json"" \ 4 -d '{ 5 "from": "hello@yourdomain.com", 6 "to": ["user@example.com"], 7 "subject": "Welcome aboard!", 8 "html": "<h1>Hello!</h1><p>Your account is ready.</p>" 9 }'Built for developers who want full control over their email infrastructure.
Simple JSON API to send emails. Works with any language or framework.
Connect via SMTP using your own Postfix or any relay service.
HMAC-signed API keys with full CRUD management from the dashboard.
Real-time queue status, delivery logs, and success/failure stats.
Reliable email queue with Redis-backed workers and automatic retries.
Run on your own server. Your data never leaves your infrastructure.
No hidden fees. No usage limits. It's free because it's yours.
Self-host on your own infrastructure. Full access to every feature.
We host it for you. Zero setup, zero maintenance.
Set up in minutes. No credit card. No usage limits. Just your own email server.