Free spam blocking software for linux

Form Spam Bot Blocker is a PHP class that can generate forms that prevent submission by spam robots without requiring human users to enter special values.

The project generates hidden inputs for forms that have special values that are verified on the server after the form is submitted to eventually detect whether the form was sent by a spam robot.

The class can generate an hidden input that contains an encoded value of the user browser, user computer IP address and the current time.

The class verifies whether these browser name and IP address are still the same, and also whether the form is being submitted by a normal time interval after it was create, like when it is submitted by a real human user.

The class also generates a text input that are invisible for the user. A human user would not fill this input. If the input is submitted with a value, it was certainly a robot.

When the class detects a situation that demonstrates the form was submitted by a robot, the application should not accept the form submission.

Spam Trainer project makes it easier for GNOME users to train spam filtering software (e.g. SpamBayes or SpamAssassin) that "learns" how to tell the difference between real email (ham) and unsolicited messages (spam).

Not all email clients have spam filtering (and training) built in, and training external filtering programs can be fiddly.

Spam Trainer was written to provide easy (drag and drop) training from the Evolution mail client, and should work just as well with any email client that supports the drag and drop protocol implemented by the GTK+ toolkit.

SSpamM comes from Semis Spam Milter is a spam filter for Sendmail that utilizes spambayes, heurestic spam filtering, and virus scanning (BitDefender, not included).

Spoink is an output-plugin for snort that works by blocking access to attackers using OpenBSDs pf api.

All you need is an OpenBSD machine (or pf compatible), and snort (last version works well).

Spoink uses a pf table and a blocking rule to stop "attackers" accessing our system. To protect from false negatives you must have a whitelist full of ips you want save (see section 2).

Spoink program only blocks attacks defined in snort rules so think for a minute what rules you want to use first.

Block Rage will be a falling blocks game with detailed graphics and animated plasmatic backgrounds.
You will be able to challenge your friend in a 2-player hotseat mode! It is strongly inspired by a superb DOS classic.
At present, the game is fully playable, but theres no real graphics nor sounds and absolutely no music.
Enhancements:
- New tile graphics
- Enhanced 2-player screen
- Improved sound module
- Fixed caps lock handling
- Sets window caption
- Other fixes

rblsd is a small, fast, SpamAssassin-compatible spam filter. It filters mail by performing a series of RBL lookups on each message. This results in fast, accurate, low-load spam filtration. This can be used as a standalone, replacement for SpamAssassin, or as an secondary filter to increase mail throughput.
As for the folks here in collegeland, were getting to that point in the semester when we discover its the fifth week already, and midterms are coming up, and all of a sudden, weve got tests. I have nearly completed a major improvement to the internal loop (the backbone of the server), but dont use it right now, because clients wont time out (you should note that the development version in cvs is rarely usable for real mail, and sometimes it wont even run normally). Here are features that Im planning for the fifth release:
Compatibility with firedns To me, rblsd and firedns seem meant for each other. This is optional, of course, just be sure your OS has copy-on-write :-).
Multiple-user configurations, with flexible passwd files.
A "lite" version, that processes a single piece of mail from input. rblsd was designed for a high volume of mail, and is indeed optimized for this, but I could create a light-weight mail filter that uses the rich ruleset of rblsd for a less hardcore user.
The ability to record marked spam (in its unprocessed form) for any reason you may need a collection of spam mails (to train a smart filter perhaps? Vipuls Razor?)
Of course, a few new knobs to turn, in order to best reduce spam, based on your particular mail flow patterns.
And of course, performance improvements.
Hopefully this will get done by November. It is possible I may have to put this off till winter break, in which case, late December, at the latest. Ill try to give occasional progress reports, so check the site back if youre interested. Meanwhile, Im going to drift back into college life and prioritize my obligations there. Have fun out there in the real world!
Enhancements:
- Countless internal changes, clean-ups, and minor bugfixes made.
- Fixed support for new resolver libraries (BIND-9).
- spamc2 rebuilt from the ground up (built from SpamAssassins spamc).
- Cleaned up the appearance of the filtered messages.
- Improved hash table performance (faster responses).
- Documentation rewritten.
- Configuration file added (see rblsd.conf).
- Custom rules based on header IP addresses added.
- Support for blacklists and whitelists via SpamAssassin configuration file added.
- Network access rules added.

spam.pl is a perl script that extracts all relaying hosts from the headers of a spam mail and sends a complaint mail to all the responsible mail server administrators.
spam.pl is free software released under the GPL license.
There is no warranty, neither expressed nor implied, that spam.pl would do what it is said to do. It is up to you to use it.
Main features:
- Use your own complaint message
- Enter your own list of friendly hosts (probably the friendly hosts that relayed the mail to you)
- You should also instruct spam.pl what email-address it should put in the From: line when it mails its complaints.
- Run the script without sending any mail to see what receivers it could extract.
- Run the script with only one specified receiver, so that you can mail yourself and see what it looks good.
- Invoke the script from inside your favorite mail program. Just pipe the whole mail including headers into this script. You can of course just save the whole mail first and then pipe it manually into this script.
- Complain through the abuse.net service.
- Resolves IP-only addresses
- Optionally extract host names to complain to from the mail bodys http:// links.
- Can be made to use the whois.abuse.net lookup service.