Broken MIME Headers

The Broken MIME Headers filter identifies Broken MIME header characteristics that result in SPAM email. Broken MIME headers occur when:

A message opening boundary delimiter is hidden by making it part of the message part header.
Email boundary parameter values exceed 70 characters.
No email boundary parameters exist.
MIME type parameters are on a line with no leading white spaces.

Options on this page let you select actions to take when Broken MIME headers are identified as SPAM email.

Set the following options to configure Broken MIME Headers filtering:

Enable Broken MIME Headers (selected by default). Select this check box to enable the Broken MIME Headers filter for the current host.

Action to be taken on email determined to be spam. 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 Broken MIME headers filter. The default value is Insert X-Header.
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.

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