Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
HaloITSM - You’re in good company 100,000+ people, from 50+ countries, trust HaloITSM to deliver their IT Service Desk.
mailcow - An open source mailserver suite.
ALVAO IT Service Management - Manage everything from ticketing to asset tracking and boost your business with one powerful ITSM platform that eases your IT department workload.
Mail-in-a-box - Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.