OutsendSend email with one API call
Outsend is the transactional email platform for developers. A clean REST API to send, track, and scale email — with contacts, campaigns, analytics, and signed webhooks.
3,000 recipients / month free · No credit card required
curl -X POST https://api.outsend.dev/v1/emails \
-H "Authorization: Bearer outsend_xxx" \
-H "Content-Type: application/json" \
-d '{
"from": "billing@yourdomain.com",
"to": "customer@example.com",
"subject": "Your invoice",
"html": "<p>Thanks for your order 🎉</p>"
}'
# → { "id": "msg_...", "status": "sent" }Everything you need to send
From the first test email to a million-message campaign, Outsend has the primitives.
Sending API
Single, batch, and scheduled sends with idempotency keys, attachments, and custom headers.
Analytics & tracking
Open and click tracking, delivery, bounce, and complaint rates — with a 14-day volume chart.
Templates & campaigns
A WYSIWYG editor, {{variable}} interpolation, contact lists, segments, and broadcast campaigns.
Signed webhooks
HMAC-signed event deliveries plus inbound provider webhooks with bounce classification.
Suppressions & deliverability
Auto suppression on hard bounces and complaints, hosted one-click unsubscribe (RFC 8058), DMARC parsing.
Multi-provider relay
Pluggable adapters — SES, Postmark, Resend, or SMTP — with retry, backoff, and rate limiting.
Simple, transparent pricing
Start free. Upgrade when you grow.
Free
- 3,000 recipients / month
- 100 recipients / day
- 10 recipients / message
- 1MB attachments / message
- 1 domain
- 1 team member
- Open & click tracking
- Signed webhooks
Pro
Popular- 20,000 recipients / month
- No daily cap
- 50 recipients / message
- 2MB attachments / message
- Unlimited domains
- Unlimited team members
- Everything in Free
- Priority support