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archivemail is a tool written in Python for archiving and compressing old email in mailboxes. It can move messages older than the specified number of days to a separate mbox-format mailbox that is compressed with gzip, or optionally just delete old email. It supports archiving IMAP, mbox, MH, and maildir format mailboxes.

Courier-IMAP is a lightweight server that provides IMAP access to maildir mailboxes. It supports folders, custom authentication modules, and virtual mailboxes. A compatible POP3 server is also provided. The source code is based on the IMAP module in the Courier Mail Server, but this build is independently repackaged to work with any other MTA that delivers to maildir format mailboxes.

Dovecot is an IMAP server whose major goals are security and extreme reliability. It uses index files to optimally store the mailbox state, which makes it very fast even with huge mailboxes. Indexes won't prevent external mailbox updates, so Dovecot is still fully compatible with standard Maildir and mbox formats. There's also a fully featured POP3 server included.

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 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.

getmail is intended as a simple, secure, and reliable replacement for fetchmail. It retrieves email (either all messages, or only unread messages) from one or more POP3, SPDS, or IMAP4 servers (with or without SSL) for one or more email accounts, and reliably delivers into qmail-style Maildirs, mboxrd files, or through external MDAs (command deliveries) specified on a per-account basis. getmail also has excellent support for domain (multidrop) mailboxes, including delivering messages to different users or destinations based on the envelope recipient address.

gnubiff is a mail notification program that checks for mail and displays headers when new mail has arrived. gnubiff features include: Multiple mailbox support, pop3, apop, imap4, mh, qmail and mailfile support, SSL & certificates support, GNOME support with complete integration to panel, GTK stand-alone support, Support for the system tray, Support for running without GUI or X, Automatic detection of mailbox format, Mail header & content display, IDLE state support for imap4, FAM support for mh/qmail/mailfile, PNG animation support, Highly configurable, HIG 2.0 compliance, Small memory usage.

imapsync is a tool for facilitating incremental recursive IMAP transfers from one mailbox to another. It is useful for mailbox migration, and reduces the amount of data transferred by only copying messages that are not present on both servers. Read, unread, and deleted flags are preserved, and the process can be stopped and resumed. The original messages can optionally be deleted after a successful transfer.

Lurker is a mailing list archiver designed for capacity, speed, simplicity, and configurability, in that order. Noteworthy features include: Google-style searching on all fields, chronology preserving threads, multilingual support, and attachment support.

MHonArc is a Perl program for converting mail or news messages into HTML archives. It can also be used to convert individual messages into HTML documents. Other capabilities include robust MIME support and powerful user customization features.

renattach is a stream filter that can identify and act upon potentially dangerous e-mail attachments. It's a highly effective way of protecting users from harmful mail content (virii and worms) by disabling or removing attachments that may be accidentally executed by the user. It is written in pure C and can quickly process mail with little overhead. Unlike a conventional virus scanner, there are no specific virus or worm definitions. Instead, it identifies potentially dangerous attachments based on filename extension and on encoded body content. It can be used from within sendmail, postfix, procmail, or pretty much anywhere else.

SendEmail is a lightweight, completely command line-based SMTP email delivery program. If you have the need to send email from a command prompt this tool is perfect. It was designed to be used in bash scripts, Perl programs, and Web sites, but it is also quite useful in many other contexts. It is written in Perl, and is unique in that it requires no special modules, and supports any platform that runs Perl. It has a straightforward interface, making it very easy to use.