Well, making a dropdown isnt really hard, but we need more details, like will only the email subject will change, or the destination? like sales go to sales@web.com and tech go to tech@web.com or every mails go to the same adress but we add a prefix in the mail title
http://demo.chevereto.com/contact Choosing a topic and write a message. For example themes: "the Complaint", "Technical problems". All in one mail, but with different themes. 🙂