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libspf2 implements the Sender Policy Framework, a part of the SPF/SRS protocol pair. libspf2 is a library which allows email systems such as Sendmail, Postfix, Exim, Zmailer and MS Exchange to check SPF records and make sure that the email is authorized by the domain name that it is coming from. This prevents email forgery, commonly used by spammers, scammers and email viruses/worms.

libsrs2 is the next generation SRS library from the original designer of SRS. It implements the Sender Rewriting Scheme, a part of the SPF/SRS protocol pair.

libvmime is a MIME manipulation library.

Sendmail implements a general purpose internetwork mail routing facility under the UNIX operating system. It is not tied to any one transport protocol - its function may be likened to a crossbar switch, relaying messages from one domain into another. In the process, it can do a limited amount of message header editing to put the message into a format that is appropriate for the receiving domain. All of this is done under the control of a configuration file. Sendmail is a trademark of Sendmail, Inc.

The OpenChange MAPI library aims to provide interoperability with an Open Source implementation of Microsoft Exchange protocols under UNIX/Linux. The current implementation offers a client-side library which can be used in existing messaging clients and offer native compatibility with Exchange Servers up to 2007. MAPI stands for Messaging Application Programming Interface and is used in the Microsoft Exchange Server groupware server. This solution works with Outlook and provides collaborative features such as a messaging server, shared calendars, contact databases, public folders and tasks.

Mew is a user interface for text messages, multimedia messages(MIME), news articles and security functionality including PGP, SSH and SSL.

MIMEDefang is a program for inspecting and modifying e-mail messages as they pass through your mail relay. MIMEDefang is written in Perl, and its filter actions are expressed in Perl, so it's highly flexible. Here are some things that you can do very easily with MIMEDefang: Delete or alter attachments based on file name, contents, results of a virus scan, attachment size, etc. Replace large attachments with links to a centrally-stored copy to ease the burden on POP3 users with slow modem links. Add boilerplate text to e-mail messages. Customize filter rules based on domain, user-name, relay machine, etc. Reject unacceptable messages, where you define what "unacceptable" means. Add or delete recipients for a message.

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.

Mutt -- "The Mongrel of Mail User Agents" (part Elm, part Pine, part mh, part slrn, part everything else) is an interactive screen-oriented mailer program that supersedes Elm, Pine, mail and mailx. Features include color support, message threading, MIME support (including RFC1522 support for encoded headers), customizable key bindings, POP3, Delivery Status Notification (DSN) support, and PGP/MIME. Mutt FAQ: http://dev.mutt.org/trac/wiki/MuttFaq

What is NeoMutt? * NeoMutt is a project of projects. * A place to gather all the patches against Mutt. * A place for all the developers to gather. Hopefully this will build the community and reduce duplicated effort.