Lettre

Lettre is a mailer library for Rust.

Courier-MTA

The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open…

Easy to use mail server for developers

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

Open source SMTP server written in Node.js

Inbucket is an email testing application; it will accept messages for any email address and make…

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

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

Email Testing for QA & Development Teams.

Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site.

NikaMail is a portable, extendable, zero-config email server.

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with…

A web based fake SMTP server for e-mail integration testing.