Subject and content filters | Detect phrases that are commonly used in the subject lines and bodies of spam emails and block similar emails from reaching the inbox. |
White lists and black lists | Manually decide whether or not you want to receive emails from a certain email address. Permitted addresses go to the white list and emails from these addresses land in your inbox; blocked addresses go to the black list and emails from them land in your spam folder. |
Virus detection | Scan emails for viruses and malware and automatically quarantine malicious emails to the spam folder. |
Quarantine and email recovery | Maintain quarantined emails for a period of 30 days. Quarantined emails can be manually recovered during this time, post which they are automatically deleted. |
Grey listing | Some solutions also allow grey listing emails from sources that are unknown but don't seem malicious. Grey listing is a process where the email is returned to the server it was sent from, with a request to have the email sent again. Spam servers are often too busy to respond to such requests, which helps the feature filter out spam emails. |
SURBL/URIBL filtering | Spam URI RBL (SURBL) and Real-time URI Black List (URIBL) filtering rejects quarantining or filtering emails with malicious URLs or links to websites classified as suspicious in previous spam emails. This helps prevent phishing attacks. |