This is done simply by marking email addresses or domains as friends or blacklisted.It will also help reduce spam by checking spam blacklist sites for known spammers and marks e-mails accordingly. You will be able to quickly and effectively delete and bounce e-mails without even having to download them.
Related Software
MailSanctity Spam Filter Anti-spam tools
Freeware
Spam Bully for Outlook Express and Outlook Anti-spam tools
I have to admit my error, this does seem to be FREEWARE. My previous comment was due to the HELP file which obviously has not been updated as it states a paid registration is required after 30 days.