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Built for deliverability, designed for developers

Every component of OctusRelay is engineered to maximise inbox placement while providing a straightforward integration experience.

Core Infrastructure

SMTP Relay

Drop-in authenticated SMTP relay that works with any application, framework, or email client. Enforced TLS encryption on all connections ensures your messages are protected in transit.

  • Authenticated SMTP with STARTTLS and implicit TLS on ports 587 and 465
  • Per-domain rate limiting and throttling controls
  • Automatic retry with exponential backoff on temporary failures
  • Compatible with WordPress, Laravel, Django, Rails, and any SMTP client
Developer Experience

REST API

A clean, well-documented HTTP API for programmatic email sending. JSON request and response payloads, comprehensive error codes, and idempotent operations make integration predictable.

  • RESTful endpoints with JSON payloads and standard HTTP status codes
  • API key authentication with per-key permission scoping
  • Batch sending for up to 1,000 recipients per request
  • Template rendering with dynamic variables
Authentication

DKIM Signing

Every outbound message is automatically signed with a 2048-bit DKIM key. This cryptographic signature proves to recipient servers that the email genuinely originated from your domain and has not been altered in transit.

  • 2048-bit RSA key pairs generated per domain
  • Automatic key rotation with zero-downtime transitions
  • DKIM alignment validation for DMARC compliance
  • DNS TXT record provided for one-step configuration
Deliverability

Domain Verification

A guided setup process walks you through adding the correct SPF, DKIM, and DMARC DNS records for your sending domain. Automatic verification checks confirm everything is configured correctly before you send.

  • SPF record generation with include mechanism
  • DMARC policy configuration with aggregate reporting
  • Automatic DNS propagation monitoring and re-verification
  • Custom return-path domain for full SPF alignment
Insights

Analytics Dashboard

Real-time visibility into every aspect of your email delivery. Track delivery rates, bounce categories, open rates, and click-through rates with granular filtering and time-range controls.

  • Real-time delivery tracking with per-message status
  • Bounce categorisation (hard, soft, policy) with root cause detail
  • Open and click tracking with domain-level aggregation
  • Exportable reports in CSV and JSON formats
Protection

Reputation Monitoring

Proactive monitoring of your sending IPs and domains across all major blacklists. Receive immediate alerts if a listing is detected, along with actionable remediation steps to restore deliverability.

  • Continuous monitoring across 80+ blacklists
  • Instant alerts via email and webhook on listing detection
  • Automated delisting request submission where supported
  • IP warm-up scheduling for new sending infrastructure
Architecture

Multi-Node Infrastructure

OctusRelay runs on a distributed architecture across European data centres. Traffic is automatically routed between nodes for redundancy and optimal delivery performance based on recipient geography.

  • Multiple relay nodes across Germany, France, and Finland
  • Automatic failover with zero message loss
  • Geographic routing for lowest-latency delivery
  • Full GDPR compliance with EU-only data residency
Integration

Webhook Events

Receive real-time HTTP POST callbacks for every delivery event. Build automated workflows that respond to bounces, opens, clicks, and complaints as they happen.

  • Events: delivered, bounced, opened, clicked, complained, unsubscribed
  • HMAC-SHA256 signature verification on every payload
  • Automatic retry with exponential backoff on delivery failure
  • Event log with 30-day retention for debugging

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