Spam sensitivity

To set the spam sensitivity for incoming mail, go to the Spam filter tab. Here you can set the score that determines whether mail should be accepted, marked as spam or simply rejected. You can also add sender addresses that should always be considered non-spam (white list) or spam (black list).

If your domain administrator has whitelisted or blacklisted a sender, you won't be able to change this behavior for your mailbox: domain settings always override mailbox settings.