3 self-hosted Postmark alternatives

Postmark is a popular proprietary tool in the mail servers space. These open-source apps let you replace Postmark with software you host and control yourself.

Best self-hosted Postmark alternatives

Postal

Mail Servers

Complete mail delivery platform for outgoing email

Replaces SendGrid, Mailgun

★ 16.7k Hard setup MIT

Cuttlefish

Mail Servers

Transactional email server with click and open tracking

Replaces Mailgun, SendGrid

★ 1.6k Medium setup AGPL-3.0

MailWhale

Mail Servers

Self-hosted transactional email relay with API

Replaces SendGrid, Postmark

★ 372 Easy setup MIT

Compare Postmark alternatives

Switching from Postmark

Moving off Postmark means trading a managed subscription for a service you run yourself. The payoff is ownership: no per-seat pricing, no vendor lock-in, and full control of your data. Start with the option above that matches your setup-difficulty comfort level — every app links to a detailed specs page and head-to-head comparisons.