

Mailsnag is described as 'Lets you build resilient SMTP integrations while protecting you from spamming customers during testing on QA and Staging environments. It is like Chaos Monkey for SMTP integrations' and is a Mail Server in the development category. There are more than 25 alternatives to Mailsnag, not only websites but also apps for a variety of platforms, including Mac, Linux, Windows and SaaS apps. The best Mailsnag alternative is Postfix, which is both free and Open Source. Other great sites and apps similar to Mailsnag are Mailpit, MailHog, Mailcatch.app and Mailtrap.


Create email addresses on demand. Send and receive real emails and attachments from code. Rest API and developer kits available.

MailSlurp: Developer Email API is the most popular SaaS alternative to Mailsnag.
Email Testing for QA & Development Teams. Catch every email your product sends, analyze it's contents, follow links and test deliverability all via the Mailosaur API.

Mailosaur is the most popular commercial alternative to Mailsnag.
Ethereal is a fake SMTP service, mostly aimed at Nodemailer users (but not limited to). It's a completely free anti-transactional email service where messages never get delivered.


Origami SMTP was created with the idea to have a fake email server for testing purposes that supported TLS. This is because the code the developer was working on at the time had several hard coded values enforcing TLS so most other solutions would not work.


Sendria (formerly MailTrap) is a SMTP server designed to run in your dev/test environment, that is designed to catch any email you or your application is sending, and display it in a web interface instead of sending to real world.

Sendria is the most popular Self-Hosted alternative to Mailsnag.
QA tool for automating end-to-end email tests. Get unlimited private email addresses and inboxes for testing new user signups, transactional emails and drip campaigns, deliverability and spam scores, etc. Integrates with your CI/CD workflow. Includes spam testing.



LunaticSMTP is a dummy SMTP server with desktop GUI for testing email sending applications.



MailDev is a simple way to test your project's generated emails during development with an easy to use web interface that runs on your machine built on top of Node.js.




