Authenticated SMTP relay and REST API for transactional and marketing email. Enterprise-grade delivery with real-time analytics, DKIM signing, and proactive reputation management.
# Send an email with the OctusRelay API curl -X POST https://api.octusrelay.com/v1/send \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "from": "hello@yourdomain.com", "to": "recipient@example.com", "subject": "Welcome aboard", "html": "<h1>Hello!</h1>" }' # Response { "id": "msg_a1b2c3d4e5f6", "status": "queued" }
Trusted by developers and businesses across Europe
From authentication to analytics, OctusRelay handles the complexity of email infrastructure so you can focus on your product.
Authenticated SMTP relay with enforced TLS encryption. Drop-in replacement for any SMTP client with zero code changes required.
Simple HTTP API for programmatic email sending. JSON payloads, comprehensive error responses, and idempotent request handling.
Automatic 2048-bit DKIM cryptographic signatures on every outbound message. Builds trust with recipient mail servers and improves inbox placement.
Guided SPF, DKIM, and DMARC configuration with automatic DNS record verification. Step-by-step setup for maximum deliverability.
Real-time tracking of delivery status, bounces, opens, and clicks. Granular reporting by domain, campaign, and time period.
Proactive IP and domain monitoring across major blacklists. Automated alerts and remediation guidance to protect your sender reputation.
Three simple steps to production-ready email delivery.
Add the DNS records we provide to authenticate your sending domain with SPF, DKIM, and DMARC.
Use your SMTP credentials or API key. Works with any language, framework, or email client.
We handle delivery optimisation, reputation management, and analytics. You focus on your product.
Start with our free tier. No credit card required. Upgrade as your sending volume grows.