6's Keen TV Listings Scanner is a program that accepts a list of your favourite TV shows, movies, actors, and actresses, and running from crontab, performs a daily search for them in gist.com's TV listings search engine, and emails you a summary of the results. You get a daily email listing 15-20 programs that you'd probably like to watch, and, of course, gist.com lets you exclude channels that you cannot access.
AMaViS (A Mail Virus Scanner) scans e-mail attachments for viruses using third-party virus scanners available for UNIX environments. It resides on a UNIX (Linux) machine and looks through the attached files arriving via e-mail, generates reports when a virus is found and sets the delivery on hold.
AfterLogic XMail Server is an email server. It supports ESMTP, TLS/SSL secure connections, SMTP authentication, account and domain aliasing, anti-spam features (IP-based and email address based), mailing lists, logging, remote administration, the Finger protocol, filters, and custom mail processing. AfterLogic XMail Server is based on the XMail server, but features simultaneous multi-user access to a POP3 mailbox, the ability to configure port numbers via a configuration file, a Windows installer, and a Web administration tool with an AJAX interface.
AqMail fetches mails from remote mailboxes (POP3), applies admin-defined filters, and stores the email in local mailboxes for POP3 daemons to serve them. It supports virtual mail domains and users. It has been tested with QMail as the MTA and with Spamassassin and ClamAV as filters.
Attachment Ripper and Displacement System (aradis) is a filter that removes attachments from email. The removed attachment is sent to a specified resource for storage. The attachment is replaced with a notice of where the removed attachment may be found. The filter can also rename filenames for security. It uses GMime for MIME handling.
AUC (Authenticated User Community) is an intranet system designed for use in an educational organization but is also useful in many other settings. It offers the ability for users to have a uniform web-based interface to discussion forums, e-mail (similar to hotmail, etc.), file management, and a searchable user database. Also, "Interactive Classrooms" provide a means for students and teachers to have a web-based extension to their in-class interaction. The system runs from a C-based monolithic CGI script. MySQL is used for database storage. Also, the web-based mail client supports MIME parts/attachments, IMAP, mbox, and multiple mail folders.
B's Harmaa is Postfix policy server that implements greylisting and sender policy framework. What differentiates it from other similar programs is its unique autowhitelist feature. When a request for delivery of a message is received by Postfix via SMTP, the triplet CLIENT_IP / SENDER / RECIPIENT is built. If it is the first time that this triplet is seen or if the triplet was first seen less than one minute ago, then the message gets rejected with a temporary error. Spammers often will not try again later, even though it is required per RFC.
BLD stands for "blacklist daemon" and is intended to serve a blacklist. The blacklist is built by simply inserting IP addresses or by using submission rate limits based on a maximum number of submissions of the same IP address within a minimum time interval. A BLD cluster can be built by configuring the daemon to notify other similar daemon(s) every time an IP address is added to the blacklist. BLD was primarily designed to fight against dictionary-based spam (by making the MTA report to BLD any host that tries to send email to an unknown user), but can be used by any program.