To Reply to a message received, either right mouse click on the message or select the appropriate toolbar button to either Reply, Forward, or Redirect.
Reply sends your response to the sender of the original message.
You can forward mail to other recipients. When you forward a message, you are simply passing it on to someone else. The message is forwarded with all attachments. If the person you are forwarding the message to replies to the message then the reply would to you by default.
Redirecting a message is similar to forwarding it. When you redirect a message, unlike forwarding, the address of the original sender remains in the From and Reply to fields. So if the person you are redirecting it to replies to the message then the reply would be to the original sender not you.
This help article applies to Intellect 3