Core

Transactional Email API

Ultra-low latency delivery for critical applications. 99.99% uptime SLA with sub-200ms processing time.

How it works

1

Trigger via API

Send emails using our high-performance REST API or SMTP relay. Single-endpoint simplicity.

2

Processed at Edge

Requests are handled by our global edge network for minimum latency, routing to the nearest region.

3

Smart Delivery

Automatic retry logic, suppression list filtering, and dedicated IP options ensure high inbox placement.

4

Confirmed Delivery

Get real-time webhooks for delivery, opens, and clicks. Know exactly when your user sees the message.

Capabilities

Sub-200ms Latency

Optimized for speed. Critical alerts and OTPs are processed and handed off to ISPs in milliseconds.

Unified Templates

Use the same templates for transactional and marketing emails. Update copy without a deploy.

Detailed Logs

7-day retention of full message content and events. Debug delivery issues with complete visibility.

Developer First

Clean REST API with OpenAPI spec. No bloated SDKs required, just send a standard HTTP POST request.

Send with Fetch API

javascript
await fetch("https://api.xmit.sh/v1/send", {
  method: "POST",
  headers: {
    "Authorization": "Bearer xmit_...",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    from: "Security <security@yourapp.com>",
    to: "user@example.com",
    subject: "Your verification code: 123456",
    template: "verification-otp",
    data: {
      code: "123456",
      expiresIn: "10 minutes"
    }
  })
});

Related features

Webhooks

Email Webhooks

Real-time notifications for email events. Get instant delivery, bounce, open, click, and complaint data pushed to your endpoint.

Insights

Email Analytics

Granular visibility into every message. Track opens, clicks, bounces, and complaints in real-time.

Design

Email Templates

Design once, send everywhere. Powerful Liquid templating with version control and real-time previews.

Frequently Asked Questions

How fast is delivery?
We optimize for sub-200ms handoff times. For time-sensitive emails like OTPs, our edge network ensures minimal latency from request to inbox.
Do I need an SDK?
No. Transmit is built to be edge-native. You can send emails using standard HTTP fetch, which is supported by Cloudflare Workers, Vercel Edge, and all modern runtimes without adding package weight.
Can I use my own html?
Absolutely. You can send raw HTML, plain text, or use our template engine. We support liquid templating for dynamic content injection.
What about dedicated IPs?
Dedicated IPs are available on our Scale and Enterprise plans. However, our reputation isolation technology often makes shared IPs sufficient for most use cases.
Get started in minutes

Start sending with Transmit

Set up in minutes. Volume-based pricing starts at $2/month.