To secure suspicious attachments

1. In the Inbound Content Filter section of the Content Filter tab, select Secure suspicious attachments.
2. Click Customize settings to:
   1. Review and customize the message that is inserted into the original message (annotates the message).
   2. Add or remove sender addresses or domains to exclude from the secure attachment rule.
   3. Click Save or Cancel to return to the Content Filter page.
3. Click Save to save your settings.