Software Map

Openmailadmin is a little administration interface to every complete IMAP mail server daemon. It supports every feature IMAP provides, and fits in most MTA configurations. A key feature is the non-standard, generic administration hierarchy which not only seperates "normal users" from "administrators", but enables the mailserver-master to create instances between them. You will be able to let other users create their own sub-users and thus either share a single mail server between different organizations or project your company's employee structure. It excels with features such as regex addresses and folder ACL management.

OfflineIMAP is a tool to simplify email reading.
It allows you to read the same mailbox from
multiple computers and ensures that your changes
will be automatically reflected on all computers.
You can use various mail clients to read a single
box or read mail while offline with full
synchronization when you reconnect. You can read
IMAP mail with readers that lack IMAP support
(same goes for SSL). OfflineIMAP's multithreaded
synchronization algorithm performs between 10 and
60 times faster than many mail readers' internal
IMAP support, and it can be used even with mail
readers that support IMAP already. There are five
available user interface modules, including
scripted execution, an interactive terminal
interface, and GUI interfaces.

Binc IMAP is a well designed, modular IMAP server for Maildir. Its goals are to be secure, stable, and fast, yet flexible and easy to maintain. It is designed to be familiar for qmail-pop3d users, uses checkpassword to authenticate, and is very easy to set up.

OverLook is a Web mail client forked from the SquirrelMail project. It attempts to change the look and feel and make it simpler to use.

IMAP Folder Manager was created to manage IMAP folders for large user bases. It can list, create, delete, and rename folders, count messages in a folder, move or copy all the messages from one folder to another, and empty a folder. It supports PROXYAUTH for easy user management and has a simple but powerful argument interface, able to do things like "create folder2, move messages from folder1 to folder2, and delete folder1" in a single compact line.

vpopmail (vchkpw) is a collection of programs and a library to
automate the creation and maintenance of virtual domain email
configurations for qmail installations using either a single UID/GID
or any valid UID/GID in /etc/passwd with a home directory. Features
are provided in the library for other applications which need to
maintain virtual domain email accounts. It supports named or IP-based
domains. It works with vqadmin, qmailadmin, vqregister, sqwebmail, and
courier-imap. It supports MySQL, Sybase, Oracle, LDAP, and file-based
(DJB constant database) authentication. It supports SMTP
authentication combined with the qmail-smtp-auth patch. It supports
user quotas and roaming users (SMTP relay after POP authentication).

NullLogic Groupware is a modular Web-based groupware and email system designed for contact management and event scheduling. Additional features include private messaging, public discussion forums, webmail, shared bookmarks, file sharing, call tracking, order processing, an XML-RPC API, and integrated POP3 and SMTP servers.

The GNU POP3 daemon is a small, fast, and efficient POP3 server. It is written with performance and RFC compliance in mind, and supports virtual domains (i.e. several domain names on the same server).

popa3d is a POP3 daemon which attempts to be
extremely secure, reliable, RFC compliant, and
fast (in that order).

The IMAP Proxy server is a caching IMAP proxy
server. It was written to reduce the load that
Webmail clients put on an IMAP server by keeping
server connections alive for reuse, thus avoiding
a new server connection for each Webmail transaction.

IndiMail is a messaging platform built using qmail and other messaging software. IndiMail has the ability to distribute the users in a domain across multiple hosts. IndiMail has multiple queues (called a queue collection), which can achiever very high concurrencies. The system IDs and configuration files used by IndiMail are all configurable through a set of environment variables, allowing you to customize IndiMail the way you want. IndiMail does not use hard-coded uid/gid in the executables, which makes it easy to distribute a binary package. IndiMail has features that any modern email server should have: SMTP, QMQP, QMTP, IMAP, POP3, DKIM, BATV, greylisting, filtering capability, and spam/virus control.