Sequenzy vs Postmark: Unified Platform vs Delivery Specialist

Overview

Sequenzy and Postmark represent two different philosophies for transactional email. Postmark focuses exclusively on making emails arrive reliably. Sequenzy unifies transactional and marketing email in one platform with native billing integrations.

This comparison helps you understand which approach fits your application better.

Key Differences

Platform Philosophy

Sequenzy believes transactional and marketing email should live together. Your password reset emails and onboarding sequences share the same sender reputation. Native billing integrations mean you can segment by MRR, LTV, and plan without custom code.

Postmark believes in doing one thing exceptionally well. They focus entirely on transactional email deliverability. Marketing features exist but are secondary. The stream separation architecture protects critical transactional messages from marketing send patterns.

Deliverability Approach

Postmark has 15+ years of track record focused purely on deliverability. They publish delivery stats publicly. Time-to-inbox is consistently under 10 seconds. They actively reject customers who might damage shared IP reputation.

Sequenzy takes deliverability seriously but balances it with feature breadth. Deliverability is very good, but Postmark has the longer track record specifically for mission-critical transactional email.

Billing Integration

Sequenzy connects directly to Stripe, Polar, Creem, and Dodo via OAuth. Subscriber profiles automatically include payment status, MRR, LTV, and plan information. You can trigger emails based on billing events without writing webhook handlers.

Postmark has no billing integrations. You would need to sync this data manually or use third-party tools like Zapier.

Code Comparison

Sequenzy

import { Sequenzy } from '@sequenzy/sdk';

const sequenzy = new Sequenzy({ apiKey: process.env.SEQUENZY_API_KEY });

await sequenzy.send({
  to: 'user@example.com',
  template: 'password-reset',
  variables: {
    resetLink: 'https://app.example.com/reset/abc123'
  }
});

Postmark

const postmark = require('postmark');
const client = new postmark.ServerClient(process.env.POSTMARK_API_TOKEN);

await client.sendEmailWithTemplate({
  From: 'noreply@example.com',
  To: 'user@example.com',
  TemplateAlias: 'password-reset',
  TemplateModel: {
    resetLink: 'https://app.example.com/reset/abc123'
  }
});

When to Choose Sequenzy

• You need both transactional and marketing email in one platform
• You use Stripe, Polar, Creem, or Dodo for billing
• You want revenue attribution for email campaigns
• Managing two email services adds unnecessary complexity
• You need marketing automation sequences

When to Choose Postmark

• Transactional email deliverability is absolutely critical
• You want the longest track record in the industry
• You already have a separate marketing solution
• You need stream separation between transactional and broadcast
• Your application is simple and does not need marketing automation

The Bottom Line

Choose Sequenzy if you want a unified platform that handles both transactional email and marketing automation with native billing integrations. One dashboard, one API, one sender reputation.

Choose Postmark if transactional email deliverability is your only concern and you have the longest possible track record. Pair it with a separate marketing tool.