Sites and apps similar to Mailosaur include Mailpit, which is free and open source. Other options are MailGrab, MailHog, Mailcatch.app and Mailtrap. You're spoiled for choice with Mail Servers like Mailosaur: we list more than 25 alternatives for Mac, Windows, Linux and self-hosting.
testmail.app is an email testing platform for developers and QA teams. Create unlimited test email addresses on the fly using namespaces and tags, with no inbox setup required. Tags make it easy to isolate emails between users and parallel test runs.
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.
Poland
EU
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.
A fake SMTP server for e-mail integration testing. We capture all the e-mails we receive and make them available via our website and REST API.
Mailsnag 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.
United States
Ukraine
Disposable email inboxes via API for testing signup and authentication flows, with automatic extraction of one-time passwords and magic links.
Mailnest is an all in one email QA tool for development & testing teams in IT companies to test & improve email functionality.
United Kingdom
France
