MailMug.net Alternatives

MailHog is an email testing tool inspired by MailCatcher, but easier to install.

Open Source

FakeSMTP is a Free Fake SMTP Server with GUI for testing emails in applications easily.

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

Email Delivery Platform that delivers just in time.
 Great for businesses and individuals.

Open Source freemium

Papercut is an operational print management platform designed for windows, macs, and Linux, helping you keep track of all your prints.

Open Source

MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a...

Open Source

Email Testing for QA & Development Teams.

Smtp4dev is an all-in-one SMTP server designed to develop and test emails in your applications.

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.

An email sandbox to inspect and debug emails in dev, staging, and QA environments before sending them to recipients in production.

freemium

maildrop is a Mail delivery agent used by the Courier Mail Server. The maildrop MDA also includes filtering functionality. maildrop receives mail via stdin and delivers in both Maildir and mbox formats.

An email and SMTP testing tool with API for developers.

A SMTP server with JavaFX GUI interface, TLS, HTML messages, and attachment support.

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.