SpamAssassin is available to all, and plays an integral part of dozens of products and services, many of which are listed below. For fairness, we're trying to keep the items in each category in alphabetical order.
Windows Applications
\[http://www.mdaemon.com AltN Technologies Mdaemon Mail Server\]
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\[http://www.hartsoft.com Catch! for Windows\] - Cheap, with unlimited domains and users, SMTP proxy for any Windows mailserver. Implements [SpamAssassin], Virusscanning (f-prot or ClamAV) and several other heuristics to keep mailboxes clean. Settings can be configured at any level, global (all domains), individual domains and per user. Implements inheritence for settings.
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\[http://www.email2pop.com eMail2Pop for AOL® and Gmail\] - eMail2Pop interfaces with America Online and Google Gmail accounts to provide POP3 and SMTP access to AOL mail and Gmail. Complete integration of [SpamAssassin] allows users to take advantage of spam filtering of AOL POP3 and Gmail POP3 mail with little configuration required.
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\[http://www.kerio.com/kms_home.html Kerio Mailserver for Windows, Linux and Mac\] - SpamEliminator analyzes each email message against multiple criteria and gives it a numerical rating. If the message rating exceeds the threshold set by the user, the message is marked as spam and filtered according to the user's wishes.
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\[http://www.nai.com/us/products/mcafee/antispam/spk_mailserver.htm McAfee® SpamKiller® for Mail Servers\].
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\[http://www.merakmailserver.com Merak Mail Server\]
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\[http://www.nospamtoday.com/server No Spam Today! SMTP Proxy\] - No Spam Today! provides a complete [SpamAssassin]™ runtime installation on a Windows™ server (supports Windows™ NT/2000/XP/2003). Our SMTP proxy software makes allows integratation of No Spam Today! for Servers into any existing SMTP infrastructure.
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\[http://www.nospamtoday.com/workstation No Spam Today! for Workstations\] - No Spam Today! runs on any Windows™ 98SE/ME/2000/NT/XP/2003 system. It easily connects to any POP3 email client. It additionally provides a wizard to enable spam protection for all your Outlook™ POP3 mail accounts.
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\[http://www.pytheas.com/pmgen.asp PYTHEAS MailGate\] - POP3 gateway for Microsoft Exchange and Lotus Domino. [SpamAssassin], anti-virus scanner interface, rules based content checking, optional outgoing mail handling.
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\[http://www.statalabs.com/products/saproxypro/ SAproxy Pro\] A spam filter for Windows. Tightly integreated with Bloomba (a search-based email client), or available on its own for any POP3-capable email program.
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\[http://www.ivasoft.biz/spammover.shtml SpamMover for Exchange 2000/2003\]: 'this application can create a folder named Spam in each Exchange 2000/2003 mailbox and move any ingoing message that is marked with specific mail header by anti-spam software like [SpamAssassin], to that folder.'
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\[http://www.spamnix.com/ Spamnix\] is a spam-blocking solution designed specifically for Qualcomm Eudora on Windows and MacOS X'.
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\[http://www.deerfield.com Visnetic Mail Server\]
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Unix Applications
\[http://www.clarkconnect.com/ ClarkConnect\] - a gateway/server with a [SpamAssassin] \[http://www.clarkconnect.com/webapp/moduleinfo.jsp?id=49 module\] (there's also a free \[http://www.clarkconnect.org/ Home Edition\] available)
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\[http://www.nmgi.com/doublecheck/ DoubleCheck Email Manager\] - virus, spam, and email policy management gateway.
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\[http://www.gibraltar.at Gibraltar Firewall\] - CD based firewall product with integrated Antispam and Antivirus capabilities
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\[http://www.kerio.com/kms_home.html Kerio Mailserver for Windows, Linux and Mac\] - (see above)
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\[http://opencompt.com Opencomputing Technologies OpenProtect\] - virus/spam e-mail filter gateway for Linux/BSD.
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\[http://www.raeinternet.com/mpp RAE Internet's MPP\] - Application framework allowing you to combine various AV scanners such as ClamAV, Sophos, F-Prot, & Cybersoft's Pattern Authority along with [SpamAssassin]
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\[http://www.canit.ca/ Roaring Penguin Software's CanIt\]
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\[http://www.marcel.lqt.ca/ Marcel Network Solution\] - CD based VPN/Firewall, Anti-spam, Anti-Virus, Block unwanted attachment, Integrated webmail.
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MacOS X Applications
\[http://www.kerio.com/kms_home.html Kerio Mailserver for Windows, Linux and Mac\] - (see above)
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\[http://www.raeinternet.com/mpp RAE Internet's MPP\] - Works with OS X using Postfix, sendmail, Qmail or Communigate Pro.
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\[http://www.spamnix.com/ Spamnix\] is 'the leading spam-blocking solution for Qualcomm Eudora on Windows and MacOS X'.
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\[http://www.tenon.com/products/post_office/ Tenon's Post.Office Mail Server\] - the 10 user version is free, provides ClamAV virus scanning, SMTP filter engine.
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Network Appliances
\[http://www.autumntech.com AutumnTECH E-mail Messaging Security Appliances\] AutumnTECH, LLC offers a proactive line of spam elimination solutions that provide filtering against a wide variety of ever-changing content.
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\[http://www.barbedwiretech.com Barbedwire Technologies' Deep Packet Inspector\]. This appears to be a Linux-based appliance which includes 'No Spam Today!' and '12 other security prevention tools'.
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\[http://www.barracudanetworks.com Barracuda Spam Firewall\]
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\[http://www.concentrico.net/products/keep.html Concentrico Keep Antispam Appliance\]
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\[http://www.digitalinfo.net Digitalinfo Networks MailPoint\]
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\[http://www.nmgi.com/doublecheck/ DoubleCheck Email Manager\] - (see above)
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\[http://www.nai.com/us/products/mcafee/antispam/spk_webshield_appliances.htm NAI SpamKiller for WebShield Appliances\]
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\[http://www.netzuno.com/ netZuno Technologies' ZunoBox\] - This easy to use fully-featured server solution includes mail server functionality with spam and Virus protection using [SpamAssassin], Amavisd-new and ClamAV.
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\[http://www.mirapoint.com/ Mirapoint MD450\] - "the MD450 provides anti-spam filtering based on the open source [SpamAssassin] engine"
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\[http://www.proofpoint.com/ ProofPoint\]
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\[http://www.ben-hur.de/ Pyramid BenHur II\] The multi-function appliance Ben Hur II by \[http://www.coreworks.de/ Coreworks Systementwicklung\] and \[http://www.pyramid.de/ Pyramid Computer\] makes use of [SpamAssassin] for spam filtering.
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\[http://www.xdefenders.com xDefenders mailDefender\]
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Service Providers
E-Mail Accounts
\[http://www.fastmail.fm/ FastMail\]: "Fast free or paid IMAP webmail with SMTP, POP & IMAP access, file storage, other domains"
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\[http://www.runbox.com/ runbox.com\]: "1 GB storage, no ads, access on Web, POP, SMTP, IMAP, WAP, and SMS, file storage"
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\[http://www.tuffmail.com/ TUFFMAIL\]: "webmail -Business /Personal IMAP, POP3, SMTP, SSL, TLS"
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Relay Services
\[http://www.messagewash.com Messagewash\] (\[http://messagewash.com/index.php?option=com_weblinks&Itemid=4&catid=9 the 'links' page\] notes that they use SA.)
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\[http://pro.vider.de/emails-scan.htm pro.vider.de E-Mail Scanning\] Cheap and efficient relay service using SA, ClamAV and Virusbuster.
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\[http://si20.com Spam Interceptor\]: (\[http://si20.com/faq the FAQ\] notes that they use SA): This is a web application which means you can use it on a Macintosh, Windows, Linux, or any operating system that has a web browser.
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Commercial Products That Might Use SpamAssassin
(We're not sure about these; it's been suggested that they use SpamAssassin, but their public websites do not give any indication either way.)
\[http://www.blackspider.com/ BlackSpider\] relay service (JustinMason: do [BlackSpider] use [SpamAssassin]? There's no indication on their website that they do.)
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\[http://www.messagelabs.com/ MessageLabs\] relay service (JustinMason: do [MessageLabs] still use SA in their system? I don't think they do, any more.)
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\[http://www.gmx.net/ GMX\] (free)mail service (they once \[http://www.heise.de/newsticker/meldung/36817 definitely\] used [SpamAssassin] and it feels like they still do, at least in parts)
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Not Listed?
If your commercial product uses SpamAssassin, and is not listed here, please feel free to edit the page and add details. However, keep it short – preferably just a link – and we reserve the right to edit or even remove whatever's published here (especially if we cannot determine from publically-accessible information that the product does use SpamAssassin).