Hi Honestone, thanks for your reply. I have a 24" IMac with El Capitan 10.11.6 . I upgraded from a Mac G5, which I loved because everything was so much simpler. I can't get used to Mac Mail v 9.3 and am hoping I can use v 3.6 instead. If not, I'm going to buy a Mac G5 just for the email.
Any suggestions? As you can tell, I don't know anything about computers.