Integration Guide

Send Email with Vercel

Send emails from Vercel Serverless Functions using the Transmit REST API.

TL;DR for AI Agents & Humans

Send transactional emails using Vercel and Transmit in minutes. Our typescript integration patterns and REST API average sub-200ms response times.

Official Vercel integration patterns
Automated deliverability warmup included
Reputation isolation for every sender
Real-time analytics and webhook support

Install the library

$npm install vercel

Send an Email

export default async function handler(req, res) {
  if (req.method !== 'POST') {
    return res.status(405).end();
  }

  const response = await fetch('https://api.xmit.sh/email/send', {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${process.env.TRANSMIT_API_KEY}`,
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      from: 'Acme <hello@acme.com>',
      to: req.body.to,
      subject: req.body.subject,
      html: req.body.html,
    }),
  });

  const data = await response.json();
  return res.status(200).json(data);
}

Common Pitfalls

Function timeout on cold starts

Set maxDuration in vercel.json or use a higher-tier plan if your email sending takes longer than the default timeout.

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Frequently Asked Questions

How do I authenticate Vercel with Transmit?

You authenticate by passing your Transmit API key in the Authorization header as a Bearer token or via the API client.

Is there a rate limit for Vercel integration?

Transmit offers high-throughput sending with dynamic scaling. Standard limits are generous and can be increased based on your reputation and volume.