Creating rules is a very effective and efficient way to manage your e-mail messages. The key elements involve determining which messages you want to filter and what you want to do with them. After deciding which messages to filter, the next step is to find the common text in those messages and set up your filtering criteria. You can filter on text in the To:, From:, or Subject: fields, a unique header, or text in the body of the message itself. You can also filter on more than one criteria. Even if you choose to discard some types of messages, it is advisable to set the rules to send the messages to a separate mailbox. This allows you to verify the correctness of the rules.
Rules for Mass mail Messages
Mass mail messages include a category keyword in the Subject line that can be used in your e-mail rule. For example, to create a rule for messages sent on behalf of departmental information, add a Subject line rule for "[DeptInfo]".