Postmark vs Resend vs SadaSend: Which transactional email API should you choose in 2026?

import { SadaSend } from 'sadasend';

// Benchmarking Developer Ergonomics & Autonomous Safety
const client = new SadaSend(process.env.SADASEND_API_KEY!);

export async function runDeliverabilityBenchmark() {
  const start = performance.now();
  
  const result = await client.emails.send({
    from: 'benchmark@yourdomain.com',
    to: 'dev-team@yourdomain.com',
    subject: 'SadaSend vs Postmark vs Resend Benchmark',
    html: '<p>Evaluating latency, DKIM alignment, and agent allowlists.</p>',
    tags: ['benchmark', 'telemetry']
  });
  
  const latency = Math.round(performance.now() - start);
  console.log(`Dispatched in ${latency}ms | Message ID: ${result.id}`);
  return { latency, result };
}