BitDefender Mail Protection
(commercial) BitDefender for Sendmail version is a secure content inspection solution which provides antivirus and antispam protection at the gateway level, by scanning all the inbound and outbound e-mail traffic for known and unknown malware.
The Blue Frog is a client application that is a part of the Blue Security Do Not Intrude Registry solution. It enables clients to easily submit opt-out requests to spammers.
(commercial) Anti-spam/anti-virus solution for Linux/UNIX mail servers based on opensource tools including MIMEDefang & SpamAssassin. Provides a simple GUI for admins, and PRO version allows optional end-user control through a web-based interface. Includes Bayesian statistical analysis and optional greylisting features. A free version is available for up to 50 users.
dgrey is a greylisting policy server that allows greylist information to be synchronized between multiple mail servers. All information is shared between the nodes and the nodes are equal; there is no master. The nodes may lose communication for a while and still be able to correctly resynchronize later.
Distributed Checksum Clearinghouse
Distributed Checksum Clearinghouse is a system of clients and servers that collect and count checksums related to mail messages. The counts can be used by SMTP servers and mail user agents to detect and reject bulk mail.
DNS Blacklist Packet Filter
DNS Blacklist Packet Filter is a Linux netfilter client that decides whether to accept or drop packets based on the results of a DNS blacklist query (such as MAPS, SORBS, or SPEWS, to name a few). One use is to filter all incoming SMTP SYN packets for spam filtering.
FuzzyOcr is a plugin for SpamAssassin that can be used on image spam. It is based on the OcrPlugin
gadoyanspam is a spam killer for qmail. It can process a message, learn a spam message, and relearn a message incorrectly marked as a spam. gadoyanspam uses and relies on DSPAM library as the anti spam engine.
GLST is an SMTP grey listing implementation that uses GDBM to store triplets and associated metadata. It can parse XMail spool files to extract SMTP connection information without the caller having to specify them in the command line.
greylstd is a greylisting server with a Unix domain socket interface that can be easily integrated into the Exim mail server. Configuration information is stored in an SQLite database, and low resource consumption is a main priority for the project.
(commercial) MagicSpam is an anti-spam product designed for specific email server solutions to target spam and remove it before it gets in your inbox.
Mail-bounce is a general-purpose Perl program for returning E-mail to the sender. It can be used for bouncing spam, sending notification to "friends" who send you viruses and much more. The text of the return message can be customised easily to your needs.
MakeViz tool of SpamViz
The MakeViz tool of SpamViz performs a topological search of Internet resources related to a domain. It can test all discovered IP addresses against blacklist servers. It can also generate a datafile of discovered information.
mod_spam_die confuses spam crawlers by giving them infinite fake email addresses. It is inspired by DIE.net and spam-conference.
nilsimsa computes nilsimsa codes of messages and compares the codes and finds clusters of similar messages so as to trash spam.
(commercial) OpenProtect is an anti-spam server that filters spam and blocks viruses, phishing, and other malware.
oSpam is a Perl & qmail based anti-Spam System. It has two main features: use it for your usenet postings, use it as your main email address.
Perl Mail Sorter
PMS is a mail sorter written in perl. Designed to provide the same basic features of procmail (i.e. sorting incoming mail into specified mailboxes), it provides a more "basic" approach to this task. The config file is more human readable, and does not provide as much of the advanced features that procmail does, which helps to keep simple tasks simple.
pop3spam is a POP3 client which connects to a POP3 server and deletes unsolicited mail. It's possible to check for messages that exceed a certain limit and to scan header lines for special patterns (regular expressions). If a message has been identified as unsolicited, it can be deleted directly from the POP3 server without the need to download it first.
Postgrey is a Postfix policy server implementing greylisting developed by David Schweikert at the ISG.EE. When a request for delivery of a mail 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 5 minutes, then the mail gets rejected with a temporary error. Read more
Proxmox Mail Gateway
Proxmox Mail Gateway provides a solution to manage your email traffic, to eliminate spam, and to block undesirable content or viruses from your email system. Proxmox uses a wide variety of local and network tests to identify spam signatures. The flexible architecture and the easy-to-use configuration interface safeguard companies against existing and new email threats.
pycmail is incoming mail sorter similar to procmail, written in python, using python syntax for mail delivery.
python Postfix Policy Server
Postfix Policy Server based on twisted Framework currently checking GreyListing and Invalid Sender Domains are supported, Dspam and some others will follow.
Pyzor is a collaborative, networked system to detect and block spam using identifying digests of messages. Pyzor initially started out to be merely a Python implementation of Razor, but due to the protocol and the fact that Razor's server is not Open Source or software libre, Pyzor was implemented with a new protocol and released as Open Source and software libre.
qmail-smtpd-auth is a patch for qmail that enables it to support SMTP AUTH protocol with the following auth types: LOGIN, PLAIN and CRAM-MD5. It's based on a previous patch that implemented LOGIN type.
This is a patch to qmail-smtpd which will allow you to optionally require clients to authenticate before the MTA will accept any mail submissions from them.
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.
rblcheck is a program which helps you perform lookups in RBL-style services, such as the MAPS RBL, DUL, or RSS listings, or the ORDB list. You can use it from either the command-line for quick lookups, or from a mail-delivery program (such as procmail or maildrop).
RBLchk is a simple utility that checks an IP address with the most useful and reliable RBLs (real-time blackhole lists).
Rspamd is a fast, modular and lightweight spam filter. It is designed to work with big amount of mail and can be easily extended with own filters written in lua or perl.
SaveMyModem is a anti-spam, mail-shaper, delete-on-server software thought for users who have a dialup connection and are sick and tired of downloading 1MB a day of spam and Win32-worm-attached messages. Since now it supports only pop3 accounts, and smtp accounts for complaining.
Scrounge is a utility for digging email addresses out of text files (your Inbox) so you can add them to the list of allowed addresses for Spamhammer.
Sendmail-AccessDB is a package for making it easy to abstract the "SpamFriend" and "SpamHater" features in sendmail, as well as those for whitelisting certain hosts/addresses/etc.
Simscan is a simple program that enables qmail-smtpd to reject viruses, spam, and block attachments during the SMTP conversation so the email never makes it into your computers. It is completely open source and uses other open source components.
Smtpblock parses your UNIX mail log to gather a list of IP addresses that have relayed mail to the local system. It then determines if the relay exists in a blacklist file and also checks for the relay in existing firewall rules.
SpamCheck is an email scanning and quarantine system for Linux systems. Making use of a number of Open Source technologies, including SpamAssassin, Exim and MySQL, it provides an easy to use, but powerful method to filter email for your domain.
spamGuard is a small application to automagically monitor malicious
spammer activity in your mail server logs. spamGuard is written purely in C, to stop spammers hanging arount. For the time being, the program supports qmail (multilog/syslog) Sendmail and Postfix.
Spamhammer is program that monitors your pop3 account for email. When email is found, a comparison is made on the "From" field of the email to addresses in in the file addresses.sp. If a match is not found, Spamhammer will delete the message from the server (optional) and send a reply to the email indicating the mail was not delivered (optional).
(commercial) SpamHippo guards email servers against damaging spam & viruses without disrupting valid messages.
Splonk is a very simple but extremely effective Spam eliminator. It is very simple to install, use and extend.
SQLgrey is a Postfix greylisting policy service with auto-white-listing written in Perl with SQL database as storage backend. Greylisting stops 50 to 90 % junk mails (spam and virus) before they reach your Postfix server.
Streamlined Blackhole List Server
The streamlined blackhole list server is a real-time, machine-automated blackhole server designed to blacklist network addresses which exceed a threshold of network spread - that is, abuse from an address which has been reported by a number of participating networks (as opposed to how most other blacklists function, based on total number of reports).
Sugarplum is an automated spam-poisoner. Its purpose is to feed realistic and enticing, but totally useless or hazardous data to wandering address harvesters such as EmailSiphon, Cherry Picker, etc. The idea is to so contaminate spammers' databases as to require that they be discarded, or at least that all data retrieved from your site (including actual email addresses) be removed.
Tagspam is a program which adds the word: SPAM into the subject line of a mail message which it identifies as spam. Identification is done by tracing Received: mail headers to identify the origin. Tagspam is useful for situations where you need to filter spam to individual users and where you don't have the ability to tag the spam at the MTA (Message Transport Agent)
Tk-RED is a procmail recipe generator. It uses a custom language Reciproc. It exports this language to a procmailrc file. Tk-RED is a graphical editor for writing recipes.
Tagged Message Delivery Agent is an OSI certified software application designed to significantly reduce (or eliminate) the amount of SPAM/UCE you receive by using unique, cryptographically enhanced (tagged) e-mail addresses.
(commercial) Vexira MailArmor is a store-and-forward virus protection application that can intercept TCP/IP port 25 (SMTP) connections or can be started using the Internet superdaemon (inetd). It spools all inbound and outbound e-mail messages and virus scans them using the Vexira Antivirus virus scanner.
(commercial) XaMime gives you the ability to block or pass email based on any set of tests you choose, varying from Virus scans to Email text content.