POP/IMAP
- agorum core Open Source Document Management/Enterprise Content Management
- Alt-N Technologies' MDaemon Email Server for Windows
- Apache James
- Axigen
- Bongo
- Citadel - uses a database-driven mail store
- CommuniGate Pro
- ContactOffice
- Courier Mail Server - uses Maildir format
- Cyrus IMAP server
- DBMail
- Dovecot - uses Maildir, legacy mbox, and experimental dbox format
- Eudora Internet Mail Server
- FirstClass
- Gordano Messaging Suite
- HMailServer
- IceWarp (IceWarp / Merak Mail Server)
- Ipswitch IMail Server
- Kerio Connect
- IBM Lotus Domino IMAP4 Server
- MagicMail
- Mailtraq
- Meldware Communication Server (Free open source multi-platform mail server)
- Mercury Mail Transport System
- Microsoft Exchange Server
- Microsoft Windows POP3 Service
- Novell GroupWise
- Novell NetMail
- Open-Xchange
- Oracle Beehive
- Synovel Collabsuite (IMAP & POP with Calendar, Chat, anti-spam, Archival, data backup)
- UW IMAP - uses mix, mbx, and legacy mbox format.
- WinGate
- XMail
- Zarafa
- Zimbra
Read more about this topic: List Of Mail Servers
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—G. Weinberg. originally quoted in “What Is Television’s World of the Single Parent Doing to Your Family?” TV Guide (August 1970)