Email API Comparison 2026

// Mailgun — Node.js
import Mailgun from 'mailgun.js';
import formData from 'form-data';

const mg = new Mailgun(formData);
const client = mg.client({
  username: 'api',
  key: process.env.MAILGUN_API_KEY,
});

await client.messages.create('yourapp.com', {
  from: 'noreply@yourapp.com',
  to: ['user@example.com'],
  subject: 'Your order has shipped',
  text: 'Order #1234 is on its way!',
  html: '<h1>Order Shipped</h1>',
});
// Response: { id: '...', message: 'Queued' }

// AWS SES v2 — Node.js
import { SESv2Client, SendEmailCommand }
  from '@aws-sdk/client-sesv2';

const ses = new SESv2Client({ region: 'us-east-1' });

await ses.send(new SendEmailCommand({
  FromEmailAddress: 'noreply@yourapp.com',
  Destination: { ToAddresses: ['user@example.com'] },
  Content: {
    Simple: {
      Subject: { Data: 'Your order has shipped' },
      Body: {
        Text: { Data: 'Order #1234 is on its way!' },
        Html: { Data: '<h1>Order Shipped</h1>' },
      },
    },
  },
}));
// Response: { MessageId: '...' }

// Postmark — Node.js
import postmark from 'postmark';

const client = new postmark.ServerClient(
  process.env.POSTMARK_SERVER_TOKEN
);

await client.sendEmail({
  From: 'noreply@yourapp.com',
  To: 'user@example.com',
  Subject: 'Your order has shipped',
  TextBody: 'Order #1234 is on its way!',
  HtmlBody: '<h1>Order Shipped</h1>',
  MessageStream: 'outbound',
});
// Response: { MessageID: '...', SubmittedAt: '...' }

// Resend — Node.js
import { Resend } from 'resend';

const resend = new Resend(process.env.RESEND_API_KEY);

await resend.emails.send({
  from: 'noreply@yourapp.com',
  to: 'user@example.com',
  subject: 'Your order has shipped',
  html: '<h1>Order Shipped</h1><p>Track your order.</p>',
});
// Response: { id: '...' }

// Frostbyte — curl (no SDK needed)
curl https://frostbyte-api.vercel.app/v1/agent-email/send \
  -H "Content-Type: application/json" \
  -d '{
    "to": "user@example.com",
    "from": "noreply@yourapp.com",
    "subject": "Your order has shipped",
    "text": "Order #1234 is on its way!",
    "html": "<h1>Order Shipped</h1>"
  }'

# No API key required for free tier
# Response: { "success": true, "messageId": "..." }