List of mail server software

This is a list of mail server software: mail transfer agents, mail delivery agents, and other computer software which provide e-mail.

Product statistics
All such figures are necessarily estimates because data about mail server share is difficult to obtain; there are few reliable primary sources—and no agreed methodologies for its collection.

Surveys probing Internet-exposed systems typically attempt to identify systems via their banner, or other identifying features. , Postfix and exim appeared to be the overwhelming leaders in mail server types, with greater than 92% share between them, having come to prominence before 2010 in each case. While such methods are effective at identifying mail server share for receiving systems, most large-scale sending environments are not listening for traffic on the public internet and will not be counted using such methodologies.

SMTP
• agorum core

• Apache James

• Axigen

• Chasquid

• Citadel

• CommuniGate Pro

• Courier

• Eudora Internet Mail Server

• Exim

• FirstClass

• Gordano Messaging Suite

• Haraka

• hMailServer

• IBM Lotus Domino

• IceWarp Mail Server (formerly Merak Mail Server)

• Ipswitch IMail Server

• Ironport

• Kerio Connect

• MailEnable

• Mailtraq

• MDaemon

• Mercury Mail Transport System

• MeTA1

• Microsoft Exchange Server

• MMDF

• Novell NetMail

• OpenSMTPD

• Openwave Systems

• Open-Xchange

• Oracle Beehive

• Oracle Communications Messaging Server

• Poste.io

• Postfix

• PowerMTA

• qmail

• qpsmtpd

• RaidenMAILD

• Scalix

• Sendmail

• Smail

• SparkEngine

• Stalwart Mail Server

• Sun Java System

• Surgemail

• vSMTP

• WinGate

• WinWebMail

• XMail

• Zimbra

• ZMailer

POP/IMAP
• agorum core

• Apache James

• Axigen

• Bongo

• Citadel/UX

• CommuniGate Pro

• Courier Mail Server

• Cyrus IMAP server

• Dovecot

• Eudora Internet Mail Server

• FirstClass

• Gordano Messaging Suite

• hMailServer

• IceWarp Mail Server (formerly Merak Mail Server)

• Ipswitch IMail Server

• IBM Lotus Domino

• Kerio Connect

• Kopano

• Mailtraq

• MDaemon

• Mercury Mail Transport System

• Microsoft Exchange Server

• Mirapoint Email Appliance

• Novell GroupWise

• Novell NetMail

• Open-Xchange

• Oracle Beehive

• Oracle Communications Messaging Server

• Qpopper

• RaidenMAILD

• RePOP

• Stalwart Mail Server

• UW IMAP

• WinGate

• WinWebMail

• Zarafa

• Zentyal

• Zimbra

JMAP
• Apache James

• Cyrus IMAP server

• Stalwart Mail server

Mail filtering
• Anti-Spam SMTP Proxy

• Axigen

• Bogofilter

• Clearswift Secure Email Gateway

• DSPAM

• fdm

• Gordano Messaging Suite

• IceWarp Mail Server

• Libraesva

• MailChannels

• MailScanner

• Mailtraq

• MDaemon

• Mimecast

• MIMEDefang

• procmail

• Proxmox Mail Gateway

• PureMessage

• Rspamd

• SurfControl

• SpamAssassin

• Thexyz

• WinGate

• Webroot

• Proofpoint, Inc.

Mail server packages
• docker-mailserver

• iRedmail

• Maddy Mail Server

• Mail-in-a-Box

• Mailcow

• Mailu

• Modoboa

• Postal

• Poste.io

• Stalwart Mail Server