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This is a port of Emmanuel Dreyfus' milter-greylist. Grey listing is a wonderful spam filtering technique, which uses a behavior trick: spammers never resend a message when they get a temporary error, whereas real MTA do. The idea is to refuse any mail on first attempt, and accept it after some time has elapsed. milter-greylist is a stand-alone milter written in C that implement grey listing.

qSheff is a wrapper for the qmail queue that scans email for viruses and spam. Infected messages are rejected before they reach the queue, so the server doesn't perform any job for them. After checking the message, it will wake the qmail queue. Some of the supported features: - Antivirus executing (ClamAV) - Header and body filtering - Subject filtering - Attachment blocking - Quarantine support - White/black lists - Single line logging for qmail - Basic DoS attack prevention - And much more...

hinfo is a utility that will display information about a host. It is primarily designed to find the owner of an IP block in order to direct spam complaints to where they may do some good. (maintainer's note: the DATAFILES are updated without the port version necessarily being updated. Expect drift on distinfo. See hinfo-update.) Although the home page of the software is at www.blars.org/hinfo.html, that page is not reachable from the FreeBSD.org domain.

Yadis is a service discovery system allowing relying parties (aka identity consumers or membersites) to determine automatically, without end-user intervention, the most appropriate protocol to use. Examples of such services are: * Single sign-on across web sites * Profile exchange and form filling * Blog anti-spam Yadis provides the first step for any service that uses identifiers for authentication, accountability, privacy controlled data exchange and more.

dbacl is a digramic Bayesian text classifier. Given some text, it calculates the posterior probabilities that the input resembles one of any number of previously learned document collections. It can be used to sort incoming email into arbitrary categories such as spam, work, and play, or simply to distinguish an English text from a French text. It fully supports international character sets, and uses sophisticated statistical models based on the Maximum Entropy Principle.

It's a lightweight, fast and reliable Sendmail milter that implements a real-time Sender e-Mail Address Verification technology. This technology can stop some kinds of SPAM with a spoofed sender's e-Mail address. Also it implements a real-time Recipient e-Mail Address Verification technology. It can be useful if your machine is a backup MX for the recipient's domains or if your machine forwards all e-Mail messages as a relay host for your domains to another internal or external e-Mail servers. It's a lite alternative for the spamilter, milter-sender and milter-ahead milters.

This is a simple sendmail milter which adds an X-RBL-Warning header to any emails that are received that come from an open relay as determined by your choice of RBL checking service (i.e. bl.spamcop.net). This is useful if you'd rather have the mail user agent (MUA) deal with potential spam rather than just blocking it in case you loose legitimate messages. Note that the X-RBL-Warning header is only set if the site was found to be an open-relay.

This plugin implements logging functionality for your webmail interface. You can choose to log to a database, a file, your system log, or any combination thereof. You can also choose which kinds of events to log, including login events, logout events, login error events, all outgoing messages, possible outgoing spam messages, and other error events. Also included is monitoring functionality that will send alert emails to the administrator when certain events trigger. If you use the timeout_user plugin, logout events caused by user timeouts will be captured. Log message format is also completely custom-defined to meet your needs in the configuration file.

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.

pxytest is a command line utility to test a host for open proxies that are vulnerable to spammer abuse. It is written in perl. Unsecured proxies currently are the most significant conduit of junk email. This is a particularly vexing problem, because open proxies, unlike open mail relays, hide the origin of the spam, making it impossible to trace. This utility tests a host to see if it is vulnerable to such abuse. See http://www.unicom.com/sw/pxytest for more information. pxytest was written by Chip Rosenthal.