API & SMTP
for transactional email
Send transactional emails via REST API or SMTP relay. Webhooks for delivery events, official SDKs, and comprehensive documentation.
Integrate in minutes
Everything you need to send and track transactional emails from your application.
REST API
Clean, well-documented REST API for sending emails, managing contacts, and querying analytics. JSON request and response format.
SMTP relay
Standard SMTP relay with TLS encryption. Drop-in replacement for any SMTP provider. Just update your credentials.
Webhooks
Real-time webhook notifications for delivery, opens, clicks, bounces, complaints, and unsubscribes.
Official SDKs
First-party SDKs for PHP, Node.js, Python, Ruby, and Go. Install from your package manager and start sending in minutes.
Authentication
API key authentication with scoped permissions. DKIM, SPF, and DMARC setup for your sending domains.
Delivery analytics
Query delivery status, open rates, click rates, and bounce data via the API. Build custom dashboards and reports.
Built for reliability
Enterprise-grade features for teams that depend on email delivery.
Loved by developers and teams
See how teams are using SendKit to power their email infrastructure.
We switched to SendKit for our transactional emails and saw deliverability jump from 94% to 99.2%. The API is clean, the docs are great, and we were integrated in under an hour.
SendKit's SMTP relay was the easiest migration we've done. We just swapped the credentials and everything worked. The real-time webhooks for bounce handling saved us weeks of work.
The campaign builder is surprisingly powerful for a developer-focused tool. We run our entire newsletter and drip sequences through SendKit now. The analytics are exactly what we needed.
What sold us was the pricing transparency. No per-contact fees, no surprise charges. We send 500K transactional emails a month and the cost is predictable every single time.
We needed both transactional and marketing email in one platform. SendKit handles our password resets, order confirmations, AND our weekly newsletter. One dashboard, one bill, zero headaches.
The automation workflows are a game-changer. We set up onboarding sequences that trigger based on user events via the API. Our activation rate improved 40% in the first month.
We switched to SendKit for our transactional emails and saw deliverability jump from 94% to 99.2%. The API is clean, the docs are great, and we were integrated in under an hour.
SendKit's SMTP relay was the easiest migration we've done. We just swapped the credentials and everything worked. The real-time webhooks for bounce handling saved us weeks of work.
The campaign builder is surprisingly powerful for a developer-focused tool. We run our entire newsletter and drip sequences through SendKit now. The analytics are exactly what we needed.
What sold us was the pricing transparency. No per-contact fees, no surprise charges. We send 500K transactional emails a month and the cost is predictable every single time.
We needed both transactional and marketing email in one platform. SendKit handles our password resets, order confirmations, AND our weekly newsletter. One dashboard, one bill, zero headaches.
The automation workflows are a game-changer. We set up onboarding sequences that trigger based on user events via the API. Our activation rate improved 40% in the first month.
Ready to send better emails?
Start for free and scale as you grow. No credit card required. Get up and running in minutes with our API and SMTP relay.