MailHog - MailHog is an email testing tool inspired by MailCatcher, but easier to install.
MailCatcher - MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a...
Mailtrap - Email Delivery Platform that delivers just in time. Great for businesses and individuals.
FakeSMTP - FakeSMTP is a Free Fake SMTP Server with GUI for testing emails in applications easily.
LunaticSMTP - Dummy SMTP server with JavaFX gui for testing email sending applications - anlar/lunaticsmtp
Sendria - 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.