THEBRIX2008 This is a great application and (nearly) unique for the Mac. I have two old POP3 email accounts which are completely overrun with spam but, occasionally, have a worthwhile email sent to them so cannot be ignored for too long. The inbuilt spam checks look "too simple" but, in fact, work very well and it takes a couple of minutes per day to manage these accounts. Much faster than downloading to an email client or redirecting to a Web mail account to filter there!
(Version 2.4.9)