Attachment Handling

This section allows you to configure attachment filtering. The following settings control how e-mail attachments are handled by the mail server.

Attachment Policy

Attachment policy defines what action will be performed when an email containing a banned attachment is received. If the email attachment matches the criteria set by Strip Behavior and Attachment Extensions options described below, the attachment policy will be performed. If Bounce is selected, the message is not delivered to the recipient and sender is notified. If Discard is selected, the message is not delivered and the sender will not be notified. If Pass is selected, the message and the attachment is delivered to the recipient.

Attachment Stripping should be disabled for Attachment Policy to take effect. This option also determines the destiny of mail containing undecipherable attachments, if they are banned in the option below (Banning Undecipherable Attachments).

Banning Password Protected Attachments

Here you can block email that contain password protected files (files zipped with a password). Password protected attachments cannot be opened and checked for viruses reliably, so it is a good idea to ban them. This option will take effect only if Attachment Stripping (described below) is disabled, and Attachment Policy (described above) is set to Bounce or Discard. If this option is enabled, then mail containing password protected attachments will be subjected to Attachment Policy (described above).

Attachment Stripping

If enabled, the email attachments matching the criteria defined by Strip Behavior and Attachment Extensions options will be removed from the mail, and the rest of the mail is delivered to the users. Enabling Attachment Stripping takes precedence over Attachment Policy. If Attachment Stripping is enabled, the Attachment Policy option described above will not take effect.

Strip Behavior

This option allows you to define banned attachments.

• All Attachments All attachments are banned.
• Specified by Attachment Extensions Only those attachments whose extension is specified in Attachment Extensions section will be banned.
• Everything except those listed All attachments with extensions that are not listed in the Attachment Extensions section below will be banned. Only those attachments with extensions listed in Attachment Extensions section will be allowed.

Attachment Extensions

Enter attachments extensions in this field. The attachments whose extensions match those listed here will be banned or exempted from banning, depending on the settings above. Extensions should be separated by spaces. More than one attachment extension can be entered on a line.