SendInfinity

Infinite Scale.
Flawless Delivery.

The email infrastructure that defies limits. Send billions with the lightness of a single API call.

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Built for Deliverability

Engineered for teams that demand the inbox

Predictable scalability, guided domain authentication, and monitoring that flags issues before customers notice.

Deploy on Friday. Sleep on Saturday.

Redundant infrastructure, pre-warmed dedicated IPs, and SPF, DKIM, and DMARC baked into every domain.

Security at every step

Active reputation monitoring, mandatory MFA, detailed audit trails, and granular access controls.

Full visibility. Zero guesswork.

Custom dashboards, full-funnel analytics, one-click exports, and anomaly detection for deliverability spikes.

Deliverability intelligence

See reputation shifts, ISP behavior, and engagement in real time

SendInfinity translates raw deliverability signals into guidance you can act on before customers notice a slowdown.

Reputation pulse

Track sender score, domain health, and complaint trends with ISP-specific diagnostics and recommended fixes.

Adaptive delivery pacing

Auto-warmup new IPs, throttle bursts, and let SendInfinity reroute traffic to protect delivery success.

Bounce forensics

Drill into soft and hard bounces, identify blocklist risks, and trigger remediation workflows directly from alerts.

Integration in minutes

Intuitive REST API, ready-to-use SDKs, and clear documentation

Provision webhooks, personalize templates, and follow delivery logs with minimal engineering overhead.

  • Step-by-step onboarding with sample requests for every language we support
  • Predictive guidance that highlights DNS issues before you hit send
  • Real-time event stream with retry logic built in
cURL
Node.js
Python
curl -X POST https://api.sendinfinity.com/v1/send \
  -H "Authorization: Bearer <TOKEN>" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "welcome@yourbrand.com",
    "to": "customer@email.com",
    "subject": "Welcome to YourBrand",
    "template": "onboarding",
    "data": {
      "first_name": "Maria",
      "plan": "Pro"
    }
  }'
Why developers choose us

Built for teams who ship fast and scale faster

Stop wrestling with email infrastructure. Focus on building features your users actually want.

Developer-First API

RESTful API with SDKs for Node, Python, PHP, Ruby, Java, Go, and C#. Comprehensive docs. Get started in under 5 minutes.

Real-Time Analytics

Track opens, clicks, bounces, and spam reports instantly. ISP-level insights. Device breakdowns. Export everything.

Scale Without Limits

From 100 to 100 million emails. Auto-scaling infrastructure. Dedicated IPs. No server management required.

Use cases

Built for product, marketing, and operations teams

Digital products

Registration confirmations, password resets, billing notices, and in-app notifications with predictable delivery.

Explore transactional email

Marketing and CRM

Behavioral journeys, A/B testing at scale, and cohort analytics tuned for retention teams.

See lifecycle marketing

Support and operations

Incident alerts, policy announcements, and integrations with internal tooling across multiple regions.

Talk with an expert

Build something legendary. Start for free.

Your first 10,000 emails are on us. No credit card required.

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