Three shapes of customer. One stack.

The product looks different depending on who's holding it. Pick the shape that matches yours and we'll surface the parts that matter — without pretending the others don't exist.

SaaS — transactional

Password resets, magic links, OTP, receipts

The latency-sensitive, low-tolerance-for-failure path. Every send is one user action away from a frustrated support ticket. Built around speed, idempotency, and webhooks.

  • API → MTA p99 under 1 second
  • Idempotency-Key header for safe retries
  • HMAC-signed webhooks with 24h backoff retries
  • Inbox-rate transparency per provider, not just account-wide
SaaS use case
Ecommerce — marketing

Welcome series, abandoned carts, win-backs

Marketing automation built on infrastructure that takes deliverability seriously. Predicate-based segments, drag-drop designer, RFC 8058 one-click unsub on every send.

  • Predicate-based segments — not Mailchimp's 5-condition cap
  • Drag-drop visual editor (MJML under the hood)
  • Send-time optimisation per recipient
  • A/B variant runner with statistical winner picker
Ecommerce use case
Developer-first

SMTP, REST, OpenAPI, six SDKs

Drop-in replacement for whatever's in your stack right now. We meet existing code where it lives — both as a 12-line REST integration and as a config-only SMTP swap.

  • SMTP relay on port 587 (STARTTLS) or 465 (TLS)
  • OpenAPI 3.1 spec, Postman collection
  • SDKs: Node, Python, Go, Ruby, PHP, Java
  • Free tier with real DKIM + webhooks (3,000/mo permanent)
Developer use case