Using a standalone spam filter is a little more work simply because it's a separate piece of software that you have to run before you open up your email software. Most standalone filters do allow you to configure them so that your standard email application is opened once you've chosen what spam to filter. This suits some people and not others.
The most popular standalone spam filter is:
Mailwasher Pro
Advantages:
Doesn't rely on specific email applications to work properly.
Disadvantages:
Two step process. Load standalone filter and then your email application.
Online spam filters
There are really two types of online spam filters. One is for business use and one is for home use. A typical example of a business type product is iHate Spam server edition where the software deletes junk email directly from the mail server before the end user even sees it. Large companies employ this type of technology.
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