yMail 

yMail can be used as a spam cleaner for your existing email setup, and also as a standalone email client.
spam cleaner stand alone email client

Aldo's SPAM Cleaner 

Aldo's SPAM Cleaner is a tool that will save you bandwidth and time deleting automatically all the SPAM, Worms, Virus, Junk emails, Unwanted emails, email attacks and almost anything you define before download them from your POP3 account.
spam email e-mail junk virus worm delete remove kill ban ads filter mail pop3

Open Sesame Spam Blocker 

Deletes email unless it comes from someone on your list or contains a password. Can reply telling the sender their email was deleted, and give them the password. Spam programs ignore these replies, but real people can resend email with the password.
spam blocker spam scrubber white list password antispam anti-spam stop spam