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iXhash is a plugin for the popular spam filter SpamAssassin. It computes MD5 checksums of fragments of the body of an e-mail and compares them to those of know spam. As such it works similar to the now standard plugins that use the Pyzor, Razor and DCC software packages from within SpamAssassin.

Spamd is a fake sendmail(8)-like daemon which rejects false mail. It is designed to be very efficient so that it does not slow down the receiving machine. spamd considers sending hosts to be of three types: blacklisted hosts are redirected to spamd and tarpitted i.e. they are communicated with very slowly to consume the sender's resources. Mail is rejected with either a 450 or 550 error message. A blacklisted host will not be allowed to talk to a real mail server. whitelisted hosts do not talk to spamd. Their connections are instead sent to a real mail server, such as sendmail(8). greylisted hosts are redirected to spamd, but spamd has not yet decided if they are likely spammers. They are given a temporary failure message by spamd when they try to deliver mail.

SQLgrey is a postfix policy service implementing a grey-listing policy. SQLgrey is written in Perl and uses DBI to access an SQL database. Its goal is reducing the SPAM reaching user mailboxes

Tagged Message Delivery Agent (TMDA) is designed to significantly reduce the amount of spam (junk-mail) you receive. TMDA strives to be more effective, yet less time-consuming than traditional spam filters. The technical countermeasures used by TMDA to thwart spam include: - whitelists: accept mail from known, trusted senders - blacklists: refuse mail from undesired senders - challenge/response: allows unknown senders which aren't on the whitelist or blacklist the chance to confirm that their message is legitimate (non-spam) - tagged addresses: special-purpose e-mail addresses such as time-dependent addresses, or addresses which only accept certain kinds of communication. These increase the transparency of TMDA for unknown senders by allowing them to safely circumvent the challenge/response system. TMDA can also be used as a general purpose local mail delivery agent to filter, sort, deliver and dispose of incoming mail.

Modern user interface. Complete support of IMAP and SMTP protocols including SSL and STARTTLS. Minimalistic resources requirements. Direct access to mail server is used (mails are not stored locally on web server). Allows for adding multiple accounts to primary one, simultaneous access to different accounts in different browser tabs is supported. Additional identities. Administrative panel for configuring main options...

E-MailRelay is a simple SMTP proxy and store-and-forward message transfer agent (MTA). When running as a proxy all e-mail messages can be passed through a user-defined program, such as a spam filter, which can drop, re- address or edit messages as they pass through. When running as a store- and-forward MTA incoming messages are stored in a local spool directory, and then forwarded to the next SMTP server on request. E-MailRelay can also run as a POP3 server. Messages received over SMTP can be automatically dropped into several independent POP3 mailboxes.

wmbiff is a dock app that displays the total number of messages or the number of unread messages in different mailboxes. It supports up to 5 mailboxes. It is also possible to execute user-defined commands on new mail arrival (for example, play a .wav file).

SpamProbe Fast, intelligent, automatic spam detector using Bayesian analysis of word counts in spam and non-spam email. Intended for use with procmail to filter inbound email. No manual rule creation required.

LabPlot is a program for two- and three-dimensional graphical presentation of data sets and functions. LabPlot allows you to work with multiple plots which each can have multiple graphs. The graphs can be produced from data or from functions.

Library of elementary mathematical functions, probability and elliptic integrals in 80-bit (x86) or 128-bit long double precision.