List of mail server software

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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. As of December 2023, 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
HCL Domino / formerly IBM Lotus Domino
hMailServer
IceWarp Mail Server (formerly Merak Mail Server)
Ipswitch IMail Server
Ironport
Kerio Connect
Koukan
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
HCL Domino / formerly 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

Mail filtering

Mail server packages

docker-mailserver
iRedmail
Maddy Mail Server
Mail-in-a-Box
Mailcow
Mailu
Modoboa
Postal
Poste.io
Stalwart Mail Server

References

^ "Mail (MX) Server Survey". Security Space. Ontario, Canada: E-Soft Inc. 1 December 2023. Retrieved 19 December 2023.
"SMTP server (MTA) written in Go".
"Libraesva Email Security Gateway (ESG)". Libraesva. Retrieved 2024-06-15.
"Proxmox Mail Gateway". Proxmox. Retrieved 2021-07-04.
"Information Protection". Proofpoint. Retrieved 2017-08-30.
"docker-mailserver github". GitHub.
"iRedMail - Free, Open Source Mail Server Solution". iredmail.org.
"Composable all-in-one mail server written in Go".
"mailcow: dockerized - Blog". mailcow: dockerized - Blog.
"Mailu - Insular email distribution as container images".
Nguyen, Antoine. "Modoboa". Modoboa.
"A fully featured open source mail delivery platform for incoming & outgoing e-mail written in Ruby". GitHub.
"Poste.io".
"Stalwart - All-in-one JMAP, IMAP, SMTP mail server".

Notes

The following server types are mentioned in the Mail (MX) Server Survey but are not represented here - ArGoSoft, GroupWise, InterScan VirusWall, MagicMail, MessageWall, ModusMail, Neon Mail Server, OpenVMS, Post.Office, Trend Micro, VisNetic.
^ mentioned in Mail (MX) Server Survey 2023
uses ESMTP protocol

Email servers

Open source

Current	Apache James Citadel/UX Courier Mail Server Cyrus IMAP server Dovecot Exim hMailServer Kolab Kopano OpenSMTPD Postfix Qmail Sendmail MeTA1 Zentyal Zimbra
Discontinued	Delivermail Hula qpopper UW IMAP Zarafa

Proprietary

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