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You can run a small proxy application on your client computer that will connect to your mail server, get the email, run SpamAssassin on it, then deliver to your email client.

That's a personal proxy server.

• SAProxy by Bloomba is a Windows proxy server that's easy to set up and works quite well. It's $30.
  

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  [Pop3Proxy] \[http://mcd.perlmonk.org/pop3proxy/\] is a open source (perl) proxy server that seems to mostly work for Windows machines. Setting it up is \*not\* point-and-click easy, however.

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

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 proxy server.

• any MTA configured as a satellite system and running SpamAssassin will do that. However, setting up an MTA requires careful configuration.
  

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  The \[http://www.amavis.org/ Amavis\] 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. Though you can't benefit from personnal settings, it's very flexible does not require you to mess with your MTA's configuration.