Transactional vs Postmark

A detailed comparison between Transactional and Postmark for transactional email. See features, pricing, and developer experience side by side.

Our Verdict

Transactional wins with a more generous free tier, modern SDK, and better pricing

DETAILED COMPARISON

Feature by Feature

Category	Transactional	Postmark
Free Tier	10,000 emails/month	100 emails/month
Pricing	$1 per 1,000 emails	$1.50 per 1,000 emails
SDK Quality	TypeScript-first, fully typed	REST API only
Documentation	Interactive, code examples	Standard docs
Email Templates	React Email support	Mustache templates
Deliverability	99.9% delivery rate	99.9% delivery rate

CODE COMPARISON

See the Difference

TRANSACTIONAL

import { Transactional } from '@transactional/sdk';

const client = new Transactional({
  apiKey: process.env.TRANSACTIONAL_API_KEY
});

const { data } = await client.emails.send({
  from: 'hello@example.com',
  to: 'user@example.com',
  subject: 'Welcome!',
  html: '<h1>Hello!</h1>',
});

POSTMARK

const postmark = require('postmark');

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

const result = await client.sendEmail({
  From: 'hello@example.com',
  To: 'user@example.com',
  Subject: 'Welcome!',
  HtmlBody: '<h1>Hello!</h1>',
});

Migration Guide

Switching from Postmark to Transactional is straightforward. Here's what you need to do:

1. Install the SDK

npm install @transactional/sdk

2. Update Your API Client

Replace your Postmark client with Transactional:

// Before (Postmark)
const postmark = require('postmark');
const client = new postmark.ServerClient(process.env.POSTMARK_API_KEY);
 
// After (Transactional)
import { Transactional } from '@transactional/sdk';
const client = new Transactional({ apiKey: process.env.TRANSACTIONAL_API_KEY });

3. Update Your Send Calls

The API is similar but uses different property names:

// Postmark uses PascalCase
// Transactional uses camelCase
 
await client.emails.send({
  from: 'hello@example.com',  // was: From
  to: 'user@example.com',     // was: To
  subject: 'Hello!',          // was: Subject
  html: '<h1>Hi!</h1>',       // was: HtmlBody
});

4. Verify Your Domain

Add your domain in the Transactional dashboard and verify with DNS records.

That's it! Most migrations take less than an hour.

Sources & References

[1]Postmark Developer Documentation — Postmark (ActiveCampaign)
[2]Postmark Pricing — Postmark (ActiveCampaign)
[3]G2 Postmark vs Competitors — G2

Ready to Make the Switch?

Join thousands of developers who have chosen Transactional for reliable email delivery.