Code for multiple email command buttons

Could someone please help,

I have a workbook that i have 3 command buttons on the first worksheet page

eg.
button 1 is email service
button 2 email install
button 3 email sales person.

i want to be able to send to the correct department the whole workbook based on which button i press.

I have seen the other links which doesnt have the code for having multiple buttons on the same page.

Please help