We need a custom application developed for an SMTP server to accept email at our domain, alter the "to" email address by removing our domain name from the "to address." The subject of the email will need to be queried for a keyword--- this key word will be used to determine which HTML file is used below: Check the from address against our data base to make sure the user is authorized, then find an HTML file that matches the "from" user information. The html will then need to be...