Premium Filter

In addition to the standard antispam filter included with IMail, the optional Premium Filter provides fully automated spam protection. The Premium Filter, provided in partnership with Mail-Filters, uses a combination of technology and human editors to handle the subjective nature of spam. It consistently has high catch rates and low false positive rates with little or no user involvement. Spam signatures, created by Mail-Filters' human editors, are automatically updated in the new spam database every 10 minutes.

The Premium Spam Filter performance can be improved when users forward spam email to Mail-Filters. Mail-Filters' editors review the spam submission and add spam signature information to it; then the signature is published to the global database to help other users eliminate spam.

When an incoming message is filtered, Premium Filter settings are applied before Standard antispam settings. Premium Filter provides several tools for administrators to create, remove, and manage spam.

Enable Premium Filter (selected by default if available). Select this check box to enable the Premium Antispam filter for the current mail domain.

Action to be taken on email determined to be spam.

Action. Specify an action to take if a message is identified as spam:
- Delete. Immediately deletes the message.
- Forward to Address. Forwards the message to an email address. Enter an email address in the text box to the right of this option. By default, messages are sent to the root address and stored in a mailbox called "root-bulk". Example.
- Insert X- Header (default). Inserts an X- Header into the message indicating that the message was identified as spam by the premium filter. For more information, see X-Header Explanations.
- Move to Mailbox. Moves the message to the user's mailbox specified in the text box to the right of this option. If the mailbox does not exist, it is created. The default mailbox is "bulk".
- None. No action is performed on messages identified as spam.
Prefix subject with (cleared by default). If selected, messages identified as spam are modified to begin the message subject with the text entered in the text box to the right of this option. This field is limited to 255 characters.

Tip: We recommend that you select the Insert X- Header option instead of Delete until you know that the antispam options are setup to best suit your filtering requirements.

The following actions apply to spam filtering of message header content. These options are available on the Premium Filter Settings page. (Click Services > Antispam.)

For email determined to be from a dirty IP

Take the same action as spam. Uses the action specified in the Action to be taken for email identified as spam section.
Take the following action:
- Delete. Immediately deletes the message.
- Forward to Address. Forwards the message to an email address. Enter an email address in the text box to the right of this option. By default, messages are sent to the root address and stored in a mailbox called "root-bulk". Example.
- Insert X- Header (default). Inserts an X- Header into the message indicating that the message was determined to be from a dirty IP address by the premium filter. For more information, see X-Header Explanations.
- Move to Mailbox. Moves the message to the user's mailbox specified in the text box to the right of this option. If the mailbox does not exist, it is created. The default mailbox is "bulk".
- None. No action is performed on messages determined to be from a dirty IP address.
Prefix subject with (cleared by default). If selected, messages determined to be from a dirty IP address are modified to begin the message subject with the text entered in the text box to the right of this option. This field is limited to 255 characters.

Tip: We recommend that you select the Insert X- Header option instead of Delete until you know that the antispam options are setup to best suit your filtering requirements.