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That's a personal proxy server.

• JSpamAssassin is a POP3 Proxy Server developed in Java (platform independent). It has a friendly GUI and acts as a communication interface between the user POP3 server and Apache SpamAssassin. It runs on all OS and works with all e-mail clients (Eudora, Pegasus Mail, Netscape, Thunderbird, Outlook Express, etc.).
• ImapAssassin is a perl application which uses SpamAssassin to pre-filter an IMAP mailbox for spam, before you download it.
• No Spam Today! POP3 Proxy for Workstations (Windows™

• Wiki Markup
  \[http://sourceforge.net/projects/imapassassin ImapAssassin\] is a perl application which uses [SpamAssassin] to pre-filter an IMAP mailbox for spam, before you download it. \\

• Wiki Markup\[http://www.nospamtoday.com/workstation No Spam Today!\] POP3 Proxy for Workstations (Windows™ 98SE/ME/2000/NT/XP/2003) easily connects to any POP3 email client, and provides a wizard to enable spam protection for all your Outlook™ POP3 mail accounts. \\ Wiki Markup\[http://mcd.perlmonk.org/pop3proxy/ Pop3Proxy\] is a open source (perl) proxy server that seems to mostly work for Windows machines. Setting it up is \*not\* It's $30.
• Pop3Proxy and SaProxy : Windows (free open source) proxy based on Dan Mc Donald original work. Setting up Pop3Proxy, and some versions of SaProxy, is *not* point-and-click easy, however. Altought there was one SaProxy version point-and-click easy, it is outdated (it includes an old version of SA)
• SaProxy Pro : by Bloomba, derived from SaProxy; Windows proxy that's easy to set up and works quite well. It's $30. Seem to be some claims regarding support \\ Wiki Markup\[http://www.statalabs.com/products/saproxy/overview.php SAProxy\] by Bloomba is a Windows proxy server that's easy to set up and works quite well. It's $30. \\ \\
  
  

Site-wide proxy

You can also set up a spam proxy server that receive all your organization's incoming mail, filters it, and pass it to your organization's legacy mail server.

• No Spam Today! SMTP Proxy - Seamless SpamAssassin Integration Into Any Existing E-Mail Environment - No Spam Today! requires just a few mouse-clicks to integrate SpamAssassin into any existing Email infrastructure (supports Windows™ NT/2000/XP/2003 and Linux).
• any MTA configured as a satellite system and running SpamAssassin will do that (see IntegratedInMta). However, setting up an MTA requires careful configuration.
• Wiki MarkupThe \[http://www.amavis.org/ Amavis\] mail scanner can be set as a SMTP to SMTP proxy. Amavis sits between two SMTP mail relays, receives incoming mail, filters it through [SpamAssassin] or an optional virus filter, and drops, bounces or marks spam messages. Though you can't use personnal settings, it's very flexible and does not require you to mess with your MTA's configuration.configuration.
• MailScanner can be used in a similar way to Amavis.
• http://www.worlddesign.com/index.cfm/rd/mta/spampd.htm SpamPD can be used as an SMTP or LMTP proxy server. Other than amavis, it uses the original SpamAssassin style header/subject tags. It can't do anti-virus scans though.