Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.
Apache OpenOffice - Apache OpenOffice is an open source, office document productivity suite.
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
SSuite Office - SSuite Office is called to be one of the most accomplished software developers for both beginners and professionals alike.