SendInfinity
Deliverability. Not just delivery.

Give your product the inbox advantage

SendInfinity fuses inbox-focused infrastructure, reputation intelligence, and developer freedom so every critical email is seen, trusted, and acted on.

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99.4%
Average inbox placement
<300ms
Median API response time
120M+
Emails delivered every month

Live deliverability control

Visualize delivery, engagement, and reputation signals in a single command center.

  • Domain health dashboards with predictive scoring
  • Configurable alerts for latency, bounce, and block events
  • Instant access to raw event logs and webhooks
Built for uptime

Engineered for teams that can’t afford email downtime

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

Inbox-first architecture

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.

Actionable intelligence

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 inbox placement automatically.

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
POST /v1/send 
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 teams switch

SendInfinity outperforms legacy ESPs in the moments that matter

From onboarding to day-90 growth campaigns, we provide tooling and expertise that keeps your program ahead.

Predictive deliverability

Automatic DNS verification, inbox placement forecasting, and alerting before a bounce rate spike hurts revenue.

Operational excellence

Managed warm-up plans, automatic IP rotation, and playbooks written by our deliverability engineers.

Serious about compliance

Data residency options, SOC 2 aligned controls, and built-in consent management keep legal teams confident.

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

Ready to modernize how your company sends email?

Launch campaigns with confidence, validate domains in seconds, and monitor everything with advanced reporting.

Start your free trial Schedule a demo