Email infrastructure, minus the infrastructure
The email API that just sends
Transactional and marketing email for developers. Verified domains, tracking, webhooks, and broadcasts — behind one clean REST API.
curl -X POST https://api.sendibl.com/emails \
-H "Authorization: Bearer sb_..." \
-H "Content-Type: application/json" \
-d '{
"from": "Acme <hello@acme.com>",
"to": ["customer@example.com"],
"subject": "Your receipt",
"html": "<p>Thanks for your order!</p>"
}'One POST to send
A Resend-compatible REST API. Send your first email in under five minutes with any HTTP client.
Your domain, verified
Add a domain, get DKIM, SPF, and verification records, and send authenticated email that lands in the inbox.
See every email
Full event timelines — sent, delivered, opened, clicked, bounced — with open and click tracking built in.
Webhooks that behave
HMAC-signed payloads, automatic retries, and a delivery log so you can trust every event.
Templates & variables
Store templates once, personalize with {{variables}} at send time.
Broadcasts included
Audiences, contacts, unsubscribes, and one-click marketing sends — no second tool required.
Up and running in three steps
1
Verify your domain
Add your domain and publish the DKIM and SPF records we generate — one click if your DNS is on Cloudflare. Authenticated email is what keeps you out of spam.
2
Grab an API key
Create a key in the dashboard. The same sb_ key works for the REST API and as your SMTP password — no separate credentials to manage.
3
Send
POST to /emails from any language, point an existing Resend SDK at our base URL, or plug the SMTP relay into tools that predate REST APIs.
Already on Resend? Bring your SDK.
Sendibl's sending API is deliberately shape-compatible with Resend's, so the SDK you already installed keeps working — change the base URL and the API key, and your existing code sends through Sendibl. Same request shapes, same response shapes, none of the migration project.
RESEND_API_KEY=sb_your_sendibl_key RESEND_BASE_URL=https://api.sendibl.com
Frequently asked questions
What is Sendibl?
Sendibl is an email API for developers: transactional sends, marketing broadcasts, inbound receiving, and an SMTP relay behind one account. You verify a domain, grab an API key, and send — delivery, tracking, webhooks, and suppression handling are built in.
Is Sendibl compatible with Resend?
Yes. The sending API is shape-compatible with Resend's, so the official Resend SDKs work against Sendibl with a one-line base-URL override. If you're already on Resend, switching is a config change, not a rewrite.
Do I need a credit card to start?
No. The Free plan includes 3,000 emails per month with a verified domain, tracking, and webhooks — no card required. Paid plans start at $20/month when you outgrow it.
Does Sendibl support SMTP?
Yes, on every plan including Free. Point your app or legacy tool at smtp.sendibl.com with your API key as the password and mail flows through the same pipeline as the REST API — same logs, same webhooks.
Can I receive email, not just send it?
Yes. Inbound receiving is included on every plan: point an MX record at us and incoming mail shows up as parsed webhook events and API objects.
Ship email today
Free plan, no credit card. Upgrade when you outgrow it.
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