Best Transactional Email API in 2026

import { Resend } from "resend";

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

const { data, error } = await resend.emails.send({
  from: "Acme <hello@yourdomain.com>",
  to: ["user@example.com"],
  subject: "Hello World",
  html: "<strong>It works!</strong>",
});

import sgMail from "@sendgrid/mail";

sgMail.setApiKey(process.env.SENDGRID_API_KEY!);

const msg = {
  to: "user@example.com",
  from: "hello@yourdomain.com",
  subject: "Hello World",
  html: "<strong>It works!</strong>",
};

const [response] = await sgMail.send(msg);
console.log(response.statusCode);

import { ServerClient } from "postmark";

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

const result = await client.sendEmail({
  From: "hello@yourdomain.com",
  To: "user@example.com",
  Subject: "Hello World",
  HtmlBody: "<strong>It works!</strong>",
});
console.log(result.MessageID);

import Mailgun from "mailgun.js";

const mailgun = new Mailgun(FormData);
const mg = mailgun.client({
  username: "api",
  key: process.env.MAILGUN_API_KEY!,
});

const result = await mg.messages.create(process.env.MAILGUN_DOMAIN!, {
  from: "hello@yourdomain.com",
  to: ["user@example.com"],
  subject: "Hello World",
  html: "<strong>It works!</strong>",
});

import { SESClient, SendEmailCommand } from "@aws-sdk/client-ses";

const client = new SESClient({ region: process.env.AWS_REGION });

const result = await client.send(
  new SendEmailCommand({
    Source: "hello@yourdomain.com",
    Destination: { ToAddresses: ["user@example.com"] },
    Message: {
      Subject: { Data: "Hello World" },
      Body: { Html: { Data: "<strong>It works!</strong>" } },
    },
  })
);
console.log(result.MessageId);