I am sorry to hear that you are having trouble. That message doesn't ring a bell with me. Would you be able to send a screenshot of what you are seeing? Also, you may want to refer to this link for information on our email settings. www.cox.com/.../cox-email-settings.html .
Thanks for the clarification. "Reject with reason" is an action you can assign to a filter. It lets you generate a "bounce" message to a particular sender that you don't want emails from. You can type a message that you want to appear in the "bounce" message in the empty box or you can leave it blank to send a generic bounce message. Hope this helps.