MailWasher Pro is the first step in your email-line of defense so you can make informed decisions about your messages. You'll soon be saving much more time with MailWasher Pro - read all your email on the server and delete the messages you don't want, then download only the messages you want to keep and reply to. It's easy to set MailWasher Pro to remove all the spam automatically too so you never see it.

MailWasher makes it easy to distinguish between good email and bad email, simply by using colours (which you can personalize to suit) and giving you the status of each message.

Directly quoted from here.