EDIT: This solution requires you putting the email in between the anchor links. Why would you not?
I would not worry about it. Most browsers (all modern ones) would allow a user to right click and copy the email to their clipboard in the worst case. Its not such a mission critical feature that I would worry about it. If they do click it, I believe the browser will ask the user what mail client they would like to associatemailto
links to.
The only other choice would to allow them to fill out a form that your mail server will generate into an email and then send to the appropriate recipients.