The classic email sending library for PHP
Local, web-based mail server application. Slurp mails into oblivion!
Mail hosting made simple
mailcow: dockerized
Disposable webmail server (similar to Mailinator) with built in SMTP
Fast and easy-to-use webmail front-end for your existing mail server.
Web and API based SMTP testing
Zentyal is a Linux Small Business Server
A serverless email server on AWS using S3 and SES
an 'auto-reply' bot for your mail server
CheckeredFlag is a super simple mail server.
Webkosa is the open source edition of Webcrossing.
Linux Mail Server with Calendaring and IM
A lite version of mailinator for developer use