Internet (POP3 or IMAP4, SMTP):
* CommuniGate Pro by Stalker Software Inc. for Linux, Solaris, and Rhapsody. POP3/IMAP4/SMTP * Contact by Samsung supports POP3/IMAP/SMTP/LDAP and Outlook/calendaring. Formerly OpenMail, here is how HP described it: "OpenMail is HP's strategic business messaging and collaboration solution for Linux and UNIX systems, based on Internet standards. Perhaps its most notable feature is the way that it offers a choice of desktops, including Microsoft's Outlook. No other non-Microsoft server supports the richness of Outlook as deeply as OpenMail, including support for calendaring, wide-area scheduling, public folders and delegation. OpenMail has an installed base of 15 million seats, with representation in 60 percent of the Fortune 1000. OpenMail is the No. 3 business-messaging product, in terms of Fortune 500 installed base, according to respected industry consultants Creative Networks, Inc." * Courier by Double Precision, Inc. "The Courier mail transfer agent (MTA) is an integrated mail server suite that provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. It grew out of several related projects, that merged together (more on that later). Courier implements SMTP extensions for mailing list management and spam filtering. Courier can function as an intermediate mail relay, relaying mail between an internal LAN and the Internet, or perform final delivery to mailboxes. Courier uses maildirs as its native mail storage format, but it can also deliver mail to legacy mailbox files as well." * The following components come with Courier, or can be used standalone: * Maildrop (mail delivery agent with filtering abilities) by Double Precision Inc. * Courier-IMAP by Double Precision, Inc. "is a server that provides IMAP access to Maildirs. This IMAP server does NOT handle traditional mailbox files (/var/spool/mail, and derivatives), it was written for the specific purpose of providing IMAP access to Maildirs." * Cucipop, (mirror) Cubic Circle's POP3 daemon, by S.R. van den Berg. "Requires ANSI-C and POSIX compliant system. For the vpop and bulletin support, you need the Berkeley DB version 2.x, see http://www.sleepycat.com/" ... "A fast and robust implementation of the RFC1939 POP3 protocol. It supports both BSD-type and SysV-type mailbox formats. Cucipop assumes that the mailbox it serves is not simultaneously accessed by a mailreader. Concurrency and locking issues are handled graciously if they restrict themselves to the mail delivery agent." * PAM Cucipop patch for Cucipop. "PAM, Pluggable Authentication Modules is a flexible authentication mechanism" * Cyrus IMAP Server by Carnegie Mellon's Cyrus Group * Cyrus IMAPd utilities at sourceforge "The Cyrus IMAPd Utilities project brings together maintenance utilities, graphical front-ends, and API handlers (such as notification daemons)." * Cyrus FAQ at Sourceforge * DMail by NetWin for Unix (inc. Max OS X) and Win has SMTP, POP3, IMAP, LDAP Auth, Webmail, and list server. * eServer.mail by Technauts is a POP3/IMAP/webmail server for Linux. * exim Internet Mailer by Nigel Metheringham is an SMTP server for Unix. "Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet." * Email: Exim 3, part of the DOSSIER series. * eXtremail by Richard Gonzalez is a free POP3/IMAP4/SMTP server for Linux (soon Solaris and Irix). Supports virtual domains. * GNU pop3d is a small, fast, and efficient POP3 server. * Inframail by Infradig for Windows or Unix is a mail server (POP, IMAP, web-mail, mailing lists) and news server. * InsightConnector by Bynari turns IMAP servers with ACLs into fully- functional Exchange-like servers for all versions of Microsoft Outlook. If you're struggling with whether or not to upgrade to Exchange 2000, here's a third-party plugin that allows you to use low cost Unix/Linux servers to host Outlook while maintaining interoperability with Exchange. * InterMail by Software.com (POP3/IMAP/web/SMTP, auth SMTP) * jServe by EveryDay Objects, Inc., is a Java server (e-mail, web, and ftp). * Kerio MailServer by Kerio. IMAP/Web/WAP. Collects from remote POP servers (but I don't think it allows POP access itself?). Antivirus and antispam features. Allows shared folders to share messages with colleagues. Windows or Linux versions. * M-Store by MessagingDirect is a robust message server that delivers exceptional scalability, performance, and ease of operation. Features include a centrally managed, highly scalable universal message store accessible via IMAP4, POP3 or the web. Messages can be simultaneously accessed from several external processes. Administration is performed locally, or remotely via a fully secure web administration tool. M-Store is currently available for Red Hat 6.0 Linux, IRIX - 6.5, Solaris 2.5.1 and Solaris 2.7, & AIX 4.2 Windows NT 4.0 (third-quarter 2000) * MailEngine by Lyris. "Lyris MailEngine is email delivery software that sends or relays email up to 150,000 messages per hour from a single mail server, depending on hardware and Internet connection." * MailOne by OpenOne " for UNIX, an Internet standards-based e-mail server built on Digital Equipment Corporation? MailWorks for UNIX technology, has been re-engineered by OpenOne Corporation for open systems. The MailOne provides a secure message store, bulletin boards, message transport and directory services. The server exchanges messages using multiple industry standard messaging protocols including Sendmail, commercial SMTP/MIME message transports, or optionally, X.400 protocols, and uses any LDAP or SLAP directory service that is University of Michigan LDAP V3.3 compliant." * mPOP "is a simple, convenient and robust multi-domain virtual POP3 mail hosting solution. With mPOP any number of domains residing on a single server can be managed with a simple web-based administration tool." POP3/SMTP and webmail. * Netscape Messaging Server by Netscape. (purchase software, licenses, tech support, or books) * Netscape Messaging Server Hosting Edition * Netscape SuiteSpot Server includes Messaging Server as well as web and directory servers. (purchase software, licenses, tech support, or books) * Novell Internet Messaging System (NIMS) for Linux/Unix by Novell. is a standards-based messaging system supporting SMTP, POP3, IMAP4, SSL, HTML and LDAP. NIMS offers secure data transmission, extensive scalability, reliability and centralized administration. NDS eDirectory integration adds an unprecedented level of manageability and control.. Any client supporting POP3 or IMAP 4 can be used with NIMS in addition to the included Web (HTML) client. NIMS will run on NetWare, Solaris and Linux platforms. NIMS provides extensive anti-spam measures and includes Rules Server and List Server capabilities. * NIMS Info * N-Plex Internet Messaging Servers by Critical Path. POP3/IMAP/SMTP/LDAP * POP3Lite "is a flexible, RFC 1939 compliant Post Office Protocol 3 daemon." * <>by Wietse Venema is his "attempt to provide an alternative to the widely-used Sendmail program." Formerly known as SecureMailer by IBM/AlphaWorks. * The Book of Postfix by Ralf Hildebrandt and Patrick Koetter (No Starch Press, October 2003, paperback) details how to set up Postfix, whether for home or company use. * qmail by Dan Bernstein is an SMTP server, also an alternative to Sendmail. It strives for security, reliability, efficiency, and simplicity, according to the site. * Running qmail book by Rich Blum * Life with QMail web site by Dave Sill * oMail-admin by Olivier Mueller is a PHP4-based Web front end to qmail/vmailmgrd. It can be used by domain owners and single users to easily administer their mail accounts without bothering the sysadmin. Its features include mailbox/alias management, auto-responder (vacation-like) support, changing passwords, and support for French, English, Spanish, Italian and German. * The oSpam project by Olivier Mueller, a qmail based anti-Spam System. Allows for white board and expiring aliases. * VMailMgr (Virtual Mail Manager) is a package of programs designed to manage multiple domains of mail addresses and mailboxes on a single host. It co-operates with qmail for mail delivery and program control. * QPopper for Unix/Linux by Qualcomm. Includes TLS/SSL. * mailing lists * QPopper list web subscription interface. * RecipeMail from RecipeXperience. Does webmail with Windows-style interface, also has a POP/SMTP component so you can use your existing client. Linux/Windows. * Sendmail by Sendmail, Inc. The Sendmail Consortium will maintain a page devoted to the freeware version of Sendmail. * Email: Mail and Sendmail part of the DOSSIER series * ksendmail Sendmail Server Manager?s a management system for Sendmail, it is designed to make easy-of-use the Sendmail adminitration tasks.? * Sendmail FAQ * Virtual Domain Hosting with Sendmail * Sendmail Performance Tuning published 2003, by Nick Christenson. * Sendmail for Linux book by Rich Blum * Sendmail: Theory and Practice by Frederick M. Avolio, Paul Vixie * Installing Sendmail 8.8.8 on IRIX 6.3 * smail (alternate site) by Ronald S Karr and others is an MTA * smtpd/smtpfwdd by Obtuse, part of their Juniper firewall toolkit, or may be used standalone. "The smtpd daemon talks the Simple Mail Transfer Protocol (SMTP) with other SMTP daemons to receive mail from them, and saves it into a spool directory for later processing. It is the store portion of an SMTP store and forward proxy. The symbiotic companion program smtpfwdd is used to forward the spooled mail on to its eventual destination." * Sun Internet Mail Server from Sun. Supports LDAP, ESMTP, MIME, HTML, IMAP4, POP3, TCP/IP, Notary, and others. Includes Webmail support. * SuSE eMail Server III from SuSE "is an Open Source solution based on tested, reliable components which comply with Internet standards such as SMTP, IMAP4, POP3, or LDAP. [and webmail] The number of possible e-mail users per server is virtually unlimited and depends only on the server hardware." * Teapop by Toontown. "Teapop is an RFC1939 and RFC2449 compliant POP3-server, which is quickly gaining world-wide recognition. With its' flexible virtual domain support, Teapop distinguishes itself from other POP3-servers. The possibility to authenticate users in several different ways, for example PostgreSQL-databases and Apache htpasswd files, lets Teapop adapt itself to Your setup, rather then the other way around as with traditional POP3-servers. Teapop is known to compile under most popular UNIX flavours available." * TradeServer by Bynari supports messaging and collaboration. Components include IMAP, LDAP, iCalendar, SMTP, and POP3 * University of Washington IMAP Server. Also includes a POP gateway to IMAP, so POP clients can access the server as well. * WebCrossing is a "community" package, meaning it provides a web site and communication packages for virtual communities. Web, Webmail, POP3/IMAP/SMTP, web-based and NNTP forums, and can run mailing lists. * XMail "is an Internet and intranet mail server featuring an SMTP server, POP3 server, finger server, multiple domains, no need for users to have a real system account, SMTP relay checking, RBL/RSS/ORBS/DUL and custom ( IP based and address based ) spam protection, SMTP authentication ( PLAIN LOGIN CRAM-MD5 POP3-before-SMTP and custom ), a POP3 account syncronizer with external POP3 accounts, account aliases, domain aliases, custom mail processing, direct mail files delivery, custom mail filters, mailing lists, remote administration, custom mail exchangers, logging, and multi-platform code. XMail sources compile under GNU/Linux, FreeBSD, Solaris and NT/2K." * ZMailer for Unix is an SMTP server.
Utilities and specialized servers:
* Fetchmail by Eric Raymond, is a full-featured, robust, well-documented remote-mail retrieval and forwarding utility intended to be used over on-demand TCP/IP links (such as SLIP or PPP connections). It supports every remote-mail protocol now in use on the Internet: POP2, POP3, RPOP, APOP, KPOP, all flavors of IMAP, and ESMTP ETRN. It can even support IPv6 and IPSEC. Fetchmail retrieves mail from remote mail servers and forwards it via SMTP, so it can then be be read by normal mail user agents such as mutt, elm(1) or BSD Mail. It allows all your system MTA's filtering, forwarding, and aliasing facilities to work just as they would on normal mail. * HoboServer runs on Unix/Linux or NT and lets companies run their own secure wireless Palm mail service. Quoting the web site: The HoboServer offers three distinct advantages: 1) Secure Wireless Transmissions with the state of the art SSL protocol. 2) Easy to setup and install on your existing hardware infrastructure. 3) Anywhere wireless access to email using the same tried and true Hobomail service available to the public at Hobomail.com. * MasqMail by Oliver Kurth "is a mail server designed for hosts that do not have a permanent internet connection eg. a home network or a single host at home. It has special support for connections to different ISPs. It replaces sendmail or other MTAs such as qmail or exim." * NetAuth by NetWin is a multiplatform CGI which allows users to create new accounts on a mail system, and an administrator to manage accounts, change passwords, etc. * Perdition "Perdition is allows users to connect to a content-free POP3 or IMAP4 server that will redirect them to their real POP3 or IMAP4 server. This enables mail retrieval for a domain to be split across multiple backend servers on a per user basis. This can also be used to as a POP3 or IMAP4 proxy especially in firewall applications." * POP3 Gateway - E-mail middleware for remotely hosted websites by J.A. Korsmeyer, Inc. POP3 to SMTP gateway and XMLdb extractor - POP3 Gateway is the leading platform independent solution for automatically replicating e-mail, e-commerce data and webform submissions from remotely hosted websites into servers on your local LAN over any type of Internet connection including dial-up. * ThinAirServer by ThinAir Apps. The ThinAir Server platform is a software solution that lets you deploy wireless access to the critical data your users need. Bundled with the server "out of the box" are ready-to-use applications that give you secure, real-time access to popular messaging and groupware platforms. With ThinAir Server's Groupware access for Microsoft Exchange Server? Lotus? Domino Server, or any POP or IMAP messaging system, you can begin realizing immediate benefits of any time, anywhere access to information.
* poppassd is a unix server for the "poppassd" protocol used by the Eudora "Change Password" command. * poppassd. This site has versions of poppassd as well. Use an FTP client if your browser won't work with this site. * password servers from Qualcomm. * poppassd from NetWin