If the email appears to be included on any item except the exception list, then the spam is marked with a red checkmark. If the email does not contain any information in any of these settings, then the email is not marked. I cannot get Spam Buster to work with AOL, MSN, Juno, or free web based email services. Spam Buster requires a POP3 email account. None of these services are POP3 accounts, or they have their own proprietary email service.
Web based email falls into the same category.
Some services such as Yahoo mail do allow you to set up a POP account, and as such could be used with Spam Buster. Spam Buster checks the email at the server before it reaches your email program. Therefore it doesn't matter which email program you use, because the spam has already deleted before you start your email program. The only requirement is that you have a POP3 email account. Spam Buster will attempt to complete some of the information for your setup of the email accounts to check.