Sub-200ms p95 latency
Global edge locations and warm SMTP connections keep OTPs snappy for every user, everywhere.
Transactional Email
OTPs, receipts and password resets — delivered in milliseconds
A blazing-fast REST API for transactional email with multi-provider support, scoped API keys and full webhook visibility.
Why teams choose Notifyr
The developer-first transactional email API
Multi-provider support
Attach AWS SES, SendGrid, Mailgun or SMTP per sender profile. Switch providers by editing the sender, no code changes.
Scoped API keys
Issue read-only, send-only or admin keys with per-key rate limits and IP allowlists.
HMAC-signed webhooks
Sent, delivered and failed events with SHA-256 signatures and retries.
Idempotency & retries
Idempotency keys prevent duplicate sends and every failure is retried with exponential backoff.
Every language, no SDK lock-in
Plain JSON REST — call it from Node, Python, Go, PHP, Ruby, or any HTTP client. Copy-paste curl snippets in the docs.
Everything you get out of the box
All the primitives you need to launch, track and iterate — with none of the plumbing.
- One REST endpoint for all transactional flows
- Multi-provider support (SES, SendGrid, Mailgun, SMTP) via sender profiles
- Handlebars templates with server-side rendering
- Attachment support up to 25MB
- Immutable email logs with full payload for debugging
- Rate limits up to 10,000 requests/second
- 99.99% uptime SLA on Scale plans
1
Create an API key
Generate a scoped, IP-restricted key from the dashboard in one click. Rotate keys anytime without downtime.
2
Hit the /v1/emails endpoint
Send raw HTML or reference a template. Idempotency keys and metadata are supported out of the box.
3
Listen to webhooks
Subscribe to delivery events with HMAC-signed webhooks — retry logic and dead-letter queues handled for you.
4
Debug in the dashboard
Every send is logged with the full request, response, provider payload and delivery timeline.
FAQ
Frequently asked questions
Is Notifyr a good SendGrid alternative for OTPs?+
Yes. Notifyr sits on top of AWS SES, SendGrid, Mailgun and SMTP so you can migrate without changing your provider account. Attach different providers to different sender profiles to isolate workloads.
How fast is the API?+
p95 latency is under 200ms for send acknowledgement. Actual delivery to the recipient inbox depends on the underlying provider and destination ISP.
Do you support custom SMTP relays?+
Yes. Configure any SMTP relay per project. Notifyr will orchestrate sends, tracking and retries on top of your own relay.
What happens if a provider goes down?+
Notifyr automatically retries on your other configured providers. Circuit breakers and health checks route around degraded providers within seconds — no manual primary/secondary configuration needed.
Notifyr's transactional email API is built for developers who need reliable OTP email delivery, password reset email flows, welcome emails and receipts. Use it as a modern SendGrid alternative, an AWS SES dashboard, a Mailgun replacement or a full SMTP relay for developers — with scoped API keys, HMAC-signed webhooks and multi-provider support via sender profiles.
Ready to send your first campaign?
Create a free account, connect a provider and send your first 1,000 emails in under 5 minutes.