Advanced Settings and Features of Webmail
Email filters are rules which are applied to incoming email messages. If the conditions of the filter are met, an action is performed. For example, you could create a filter that looks for email from a specific email address, and then sends that email to a special folder.
POP - Existing POP Account List
The POP feature allows you to read email from other email accounts you might use within webmail.
The sender list feature allows you to fine-tune the spam filters that are a part of your email service. You can add email addresses and specify whether to white-list (automatically approve) or black-list (automatically deny) email from those senders. It's a way to ensure that email from people you trust is never marked as spam.