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Postal

An open source mail delivery platform

Visit Postal

Postal is a self-hosted mail delivery platform designed for websites and web servers that need to send and receive email. It addresses the challenge of relying on third-party email services by providing an open-source alternative that can be run on your own infrastructure, giving you full control over your mail delivery.

The platform includes a comprehensive web interface for managing mail servers and viewing logs. It supports horizontal scaling, webhooks for delivery notifications, and IP pools to manage sender reputation. Development mode automatically holds messages for testing, and it integrates with SpamAssassin, rspamd, and ClamAV for spam and virus scanning.

Postal is intended for developers and organizations that want to self-host their email delivery. It is open source and available for self-installation, with no mention of a free plan, trial, or specific packaging such as editions or seat-based pricing on the provided page.

12 alternatives to Postal

Ranked by how well each tool replaces Postal: shared features, audience, price and popularity.

  1. Postmark

    The email delivery service that people actually like

    Covers 1 of 6 key features and has a free plan.

    Free plan
    61 out of 100 match$15/mo

  2. iRedMail

    Free, Open Source Mail Server Solution

    Covers 0 of 6 key features and has a free plan.

    Free planOpen source
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  3. Postfix

    A mail server intended as an alternative to Sendmail

    Covers 0 of 6 key features.

    Open source
    59 out of 100 match—

  4. Mailgun

    Transactional email API and SMTP service for sending, receiving, tracking, validating, and

    Covers 1 of 6 key features and has a free plan.

    Free plan
    57 out of 100 match$15/mo

  5. Mailtrap

    Modern Email Delivery for developer & product teams

    Covers 1 of 6 key features and has a free plan.

    Free plan
    56 out of 100 match$15/mo

  6. Maileroo

    SMTP relay and email API for transactional and marketing email

    Covers 1 of 6 key features and has a free plan.

    Free plan
    56 out of 100 match$10/mo

  7. PostageApp

    The easier way to send email from web apps.

    Covers 0 of 6 key features.

    56 out of 100 match—

  8. MailerSend

    Team-friendly email API for modern apps

    Covers 1 of 6 key features and has a free plan.

    Free plan
    54 out of 100 match$7/mo

  9. Courier

    The customer messaging platform for humans and AI agents.

    Covers 1 of 6 key features and has a free plan.

    Free plan
    54 out of 100 matchUsage-based

  10. SMTP.com

    Transactional and email relay API for high-volume sending

    Covers 1 of 6 key features.

    54 out of 100 match$25/mo

  11. Bird (formerly MessageBird, includes SparkPost)

    Email API for developers: send and receive email from your app or agent

    Covers 1 of 6 key features and has a free plan.

    Free plan
    54 out of 100 match$15/mo

  12. MimePost

    Developer-first email API that processes and delivers messages without storing recipient P

    Covers 1 of 6 key features and has a free plan.

    Free plan
    53 out of 100 match$50/mo