Spam: Emails that were blocked due to spam-like qualities (keywords, sender, etc.).
Viruses: Emails that were blocked due to being infected with a virus.
Quarantined: Emails that are likely spam, but aren't scored high enough to be blocked outright.
Tagged: We have "whitelisted" the message or sender.
Bad Recipient: Emails that were blocked because they were sent to an invalid recipient.
Rate Control: Emails that were blocked due to the sending server attempting to send more than 60 connections in one 30 minute period.
Allowed: Emails that were allowed to pass through the spam filter.