MailCatcher vs MailGenius: What are the differences?

MailCatcher: An email testing tool. It runs a super simple SMTP server which catches any message sent to it to display in a web interface. It catches all mail and stores it for display. It shows HTML, Plain Text and Source version of messages, as applicable; MailGenius: Email Spam Checker & Testing Tool. Send emails that don't end up in the spam folder. Find out if your email is likely to trigger spam filters. Run a free email spam and security test in less than one minute.

MailCatcher and MailGenius can be categorized as "Email Testing" tools.

Some of the features offered by MailCatcher are:

• Runs as a daemon in the background, optionally in foreground. Sendmail-analogue command
• catchmail, makes using mailcatcher from PHP a lot easier
• Keyboard navigation between messages

On the other hand, MailGenius provides the following key features:

• Prevent outsiders from spoofing your domain via personalized instructions to configure your domain properly for email
• Find out if your server or domain are on any major blacklists
• Discover how good your subject line is

MailCatcher is an open source tool with 4.81K GitHub stars and 464 GitHub forks. Here's a link to MailCatcher's open source repository on GitHub.