Developer-first email API + SMTP relay, hosted in Germany. GDPR by default — your recipients' email data stays in the EU, with SendGrid-grade deliverability.
No credit card required. 1,000 free emails/month.
curl -X POST https://api.zsender.io/v1/emails/send \
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
-d '{
"from": "[email protected]",
"to": "[email protected]",
"subject": "Test",
"html": "<p>Hi!</p>"
}'Hosted in Germany (Hetzner). Your recipients' email data is processed and stored in the EU — no US data trip.
Send emails in milliseconds with our optimized infrastructure. 99.9% uptime guaranteed.
DKIM, SPF, and DMARC configured automatically. Your emails land in the inbox, not spam.
Track opens, clicks, bounces, and more. Get instant insights into your email performance.
Clean REST API or a drop-in SMTP relay — send with a single HTTP request or point your existing app at our SMTP server.
Get instant notifications for delivery events. Integrate with your workflow seamlessly.
Send from your own domain with full DNS verification and automatic SSL certificates.
Start for free, scale as you grow.
Perfect for getting started
For growing businesses
Set up your email infrastructure in minutes with our simple REST API.
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