The deepOfix Mail Server makes it possible for organisations with minimal technical expertise to have robust messaging infrastructure. It has built in LDAP support, SMTP, POP3 and IMAP services.

deepOfix - Mail Server

Sasa is a collection of extensions to the .NET framework organized in logical, often standalone assemblies. It supports functional collections, ie. list, dictionary, queue, set, etc, Statistical and numerical functions, MIME message parsing, POP3 client, Concurrent Revisions fork-join framework, type-safe reflection, Pratt parser and lot more.

Sasa - Collection of Organized Extensions to the .NET framework. 

JES is a multi-featured hybrid MTA/MDA server written in the java programming language. It supports TLS, SSL, SMTP authentication, spam control and lot more. 

Java Email Server

All your E-mail, from all your accounts, in one place. Cypht is not your father's webmail. Unless you are one of my daughters, in which case it is your father's webmail. Cypht is like a news reader, but for E-mail. Cypht does not replace your existing accounts - it combines them into one. And it's also a news reader..

Cypht - Lightweight Open Source webmail written in PHP and JavaScript

hMailServer is an open source email server for Microsoft Windows. It supports the common e-mail protocols (IMAP, SMTP and POP3) and can easily be integrated with many existing web mail systems. It has flexible score-based spam protection and can attach to your virus scanner to scan all incoming and outgoing email. 

hMailServer - E-Mail Server for Microsoft Windows. 

C# Email Server (CES). Implements SMTP and POP3 components that can be used as a standalone server or as components in other applications. It is a port of the Java Email Server (JES). This component allows a program to accept incoming emails and process them using user defined logic.

C# Email Server - SMTP and POP3 Email Server in CSharp

Mailpile is a modern web-mail you run on your own computer. It is a personal e-mail searching and indexing tool, largely inspired by Google's popular proprietary-but-gratis e-mail service. It wants to eventually become a fast and flexible back-end for awesome personal mail clients, including webmail. It supports importing archived mails from Gmail, IMAP server, Mbox etc. It supports PGP encryption and verification of emails and recipients. 

Mailpile - Mordern Web Mail

Qpopper is the most widely-used server for the POP3 protocol (this allows users to access their mail using any POP3 client). Qpopper is normally used with standard UNIX mail transfer and delivery agents such as sendmail or smail. It supports IPV6, TLS / SSL and lot more.

Qpopper - The most widely-used POP3 server for Linux

KMail is the email component of Kontact, the integrated personal information manager from KDE. It supports the standard mail protocols IMAP, POP3 and SMTP. It supports authentication via NTLM (Microsoft Windows) and GSSAPI (Kerberos). It has  native support for inline OpenPGP, PGP/MIME, and S/MIME.    

KMail - KDE Email Application

WildDuck is a modern mail server software for IMAP and POP3. Modern being scalable, unicode-first and API-controlled. You can bundle WildDuck with Haraka and ZoneMTA to create a complete mail server. It uses a distributed database (sharded + replicated MongoDB) as a backend for storing all data, including emails. It tries to follow Gmail in product design. If there's a decision to be made then usually the answer is to do whatever Gmail has done.

WildDuck Mail Server -  Self hosted modern mail server `

Fetchmail 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, ETRN, and ODMR. It can even support IPv6 and IPSEC. 
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Fetchmail retrieves mail from remote mail servers and forwards it via SMTP, so it can then 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. Fetchmail can be used as a POP/IMAP-to-SMTP gateway for an entire DNS domain, collecting mail from a single drop box on an ISP and SMTP-forwarding it based on header addresses. (We don't really recommend this, though, as it may lose important envelope-header information. ETRN or a UUCP connection is better.)

Fetchmail 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, ETRN, and ODMR. It can even support IPv6 and IPSEC.

fetchmail - TLS-enabled mail retrieval and forwarding agent

CRSMail a 100% JAVA based E-Mail server. It supports SMTP, POP3, Plugins, Can listen on multiple ports, Log's everything to a log file etc.

CRSMail - JAVA based E-Mail server

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