Transactional-first API
Sendr is built around reliable transactional email with clean REST endpoints, batch sending, template rendering, and per-email status tracking.
Email infrastructure built the way
developers actually want it
Sendr is a full-stack email platform: send transactional emails via REST or SMTP, receive inbound messages, run broadcast campaigns, monitor deliverability, and observe every event — all from one API and dashboard.
Developer-first
Great DX is a product feature, not an afterthought. Every API decision is made with the developer experience in mind.
Reliability by default
Queue-backed delivery, automatic retries, and 99.95% uptime mean email that lands — not email that might land.
Transparent pricing
Simple tiers, usage-based overages, and no vendor lock-in. You know exactly what you pay and why.
How Sendr works
The architecture behind Sendr is designed for throughput, observability, and correctness.
Two send paths
REST API or SMTP relay — same delivery engine, same tracking and analytics. Integrate however your stack already works.
Inbound processing
Inbound emails are verified, parsed into structured records, and optionally forwarded to your webhook endpoints — closing the loop on two-way communication.
Queue-backed delivery
Email, tracking, and webhook processing run through BullMQ workers backed by Redis so API responses stay fast even under heavy load.
Scheduling & cancellation
Queue emails for future delivery with a single `scheduled_at` parameter. Cancel any queued send before it goes out.
Operational controls
Verified domains, scoped API keys (full / sending / read-only), suppression list filtering, and HMAC-signed webhook delivery out of the box.
Built for every team, not just engineers
Whether you’re shipping a transactional welcome email or running a 100k-recipient campaign, Sendr has you covered.
Developer teams
A clean, predictable REST API with official TypeScript, Python, and Go SDKs. Self-serve from sign-up to production.
Growth & marketing
Broadcast campaigns, contact audiences, cohort analytics, benchmark comparisons, and scheduled CSV reports.
High-volume senders
Dedicated IP provisioning with automated warmup, multi-region sending, and usage-based overage so you never get cut off.
Compliance-conscious teams
SPF, DKIM, DMARC, BIMI, RFC 8058 one-click unsubscribe, data residency controls, and real-time blocklist monitoring.
Everything in one platform
REST API + TypeScript, Python, Go SDKs
SMTP relay (port 2525, API key auth)
Inbound email routing & webhooks
Visual drag-and-drop email editor
React Email compatible templates
Broadcast campaigns & scheduling
Contacts & audiences
Open/click/bounce/unsubscribe tracking
Cohort analytics & benchmarks
Scheduled analytics reports
SPF, DKIM, DMARC, BIMI
Blocklist monitoring (15+ RBLs)
Dedicated IPs + automated warmup
Multi-region sending & data residency
Scoped API keys & team management
Suppression lists & one-click unsubscribe
Stripe billing & self-serve portal
Real-time system status page
Ready to see it in action?
Start for free — no credit card required.