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The Cyrus IMAP (Internet Message Access Protocol) server provides access to personal mail and system-wide bulletin boards through the IMAP protocol. The Cyrus IMAP server is a scaleable enterprise mail system designed for use from small to large enterprise environments using standards-based technologies. A full Cyrus IMAP implementation allows a seamless mail and bulletin board environment to be set up across multiple servers. It differs from other IMAP server implementations in that it is run on "sealed" servers, where users are not normally permitted to log in. The mailbox database is stored in parts of the filesystem that are private to the Cyrus IMAP system. All user access to mail is through software using the IMAP, POP3, or KPOP protocols. The private mailbox database design gives the server large advantages in efficiency, scalability, and administratability. Multiple concurrent read/write connections to the same mailbox are permitted. The server supports access control lists on mailboxes and storage quotas on mailbox hierarchies.

The qmail program is a secure, reliable, efficient simple message transfer agent. It is meant to be a replacement for the entire sendmail-binmail system that most UNIX hosts use. Although qmail holds security and reliability as its top two priorities, it is also fast. On a Pentium under BSD/OS, qmail can easily handle 200000 separate messages per day that are injected and must then be delivered to local mailboxes! Security and reliability are qmail's two strengths, however. The qmail package ensures a message, once accepted, will never be lost. An optional new mailbox format, maildir, even lets users safely read their mail over NFS, while still accepting new mail deliveries. The following features are supported: host and user masquerading, full host hiding, virtual domains, null clients, list-owner rewriting, relay control, double-bounce recording, arbitrary RFC 822 address lists, cross-host mailing-list loop detection, per-recipient checkpointing, downed host backoffs, independent message retry schedules, a drop-in sendmail replacement, and more! http://pobox.com/~djb/qmail.html

Postfix attempts to be fast, easy to administer, and secure, while at the same time being sendmail compatible enough to not upset existing users. Thus, the outside has a sendmail-ish flavor, but the inside is completely different. Some feautures: Connection cache for SMTP, DSN status notifications, IP version 6, Plug-in support for multiple SASL implementations (Cyrus, Dovecot), TLS encryption and authentication, Configurable status notification message text, Access control per client/sender/recipient/etc, Content filter (built-in, external before queue, external after queue), Berkeley DB database, LDAP database, MySQL database, PostgreSQL database, Maildir and mailbox format, Virtual domains, VERP envelope return addresses and others.

Dbmail is the name of a group of programs that enable the possibility of storing and retrieving mail messages from a database (currently MySQL, PostgreSQL or SQLite). * Scalability. Dbmail is as scalable as the database system that is used for the mail storage. In theory millions of accounts can be managed using dbmail. One could, for example, run 4 different servers with the pop3 daemon each connecting to the same database (cluster) server. * Manageability. Dbmail is based upon a database. Dbmail can be managed by changing settings in the database (f.e. using PHP/Perl/SQL), without needing shell access. * Speed. Dbmail uses very efficient, database specific queries for retrieving mail information. This is much faster then parsing a filesystem. * Security. Dbmail has got nothing to do with the filesystem or interaction with other programs in the Unix environment which need special permissions. Dbmail is as secure as the database it's based upon. * Flexibility. Changes on a Dbmail system (adding of users, changing passwords etc.) are effective immediately.

Dbmail is the name of a group of programs that enable the possibility of storing and retrieving mail messages from a database (currently MySQL, PostgreSQL or SQLite). * Scalability. Dbmail is as scalable as the database system that is used for the mail storage. In theory millions of accounts can be managed using dbmail. One could, for example, run 4 different servers with the pop3 daemon each connecting to the same database (cluster) server. * Manageability. Dbmail is based upon a database. Dbmail can be managed by changing settings in the database (f.e. using PHP/Perl/SQL), without needing shell access. * Speed. Dbmail uses very efficient, database specific queries for retrieving mail information. This is much faster then parsing a filesystem. * Security. Dbmail has got nothing to do with the filesystem or interaction with other programs in the Unix environment which need special permissions. Dbmail is as secure as the database it's based upon. * Flexibility. Changes on a Dbmail system (adding of users, changing passwords etc.) are effective immediately.

Ecartis is a open-source (GNU Licence) software package that adminsters mailing lists (similar to Majordomo and Listserv). Some of Ecartis's features include: - A modular design structure, so that you can compile what you need (and don't) - The ability to strip down MIME messages and remove their attachments. - Ability to be run in a multi-Virtual Host configuration. Take a look at the Ecartis website to get a full feature list:

Documentation for the Exim mail transport agent in multiple formats. The Exim MTA may be installed from any of the ports named mail/exim*

The Exim monitor (eximon) is a graphical user interface for the Exim mail transfer agent for Unix systems. Eximon is distributed as part of the standard Exim distribution, but its dependency on XFree86 annoys many administrators. For this reason, it is available as its own package to allow administrators to easily install Exim without installing XFree86.

The hashcash tool allows you to create hashcash tokens to attach to emails you send, and to verify hashcash tokens attached to emails you receive. A hashcash token constitutes a proof-of-work which takes a parameterizable amount of work to compute for the sender.

KBiff is a mail notification utility for the KDE project. Features: o Pure GUI Configuration o Session Management o Panel Docking o Animated Gifs o Sounds o Supported mailbox formats: mbox, maildir, mh, POP3(s), IMAP4(s), and NNTP.