Why is all my MacBook mail marked "Read" whether I have read it or not?
I just changed from POP to IMAP on my MacBook. iPhone and iPad are still POP. The laptop is running Sierra ver 10.12.6 and the Mac Mail client is ver 10.3. Every email on my laptop is getting marked "Read" whether I have looked at it there or not. I understand why this is happening (because my phone's and pad's pulling down the email gets counted as a read) but can't figure out how to fix it. I have looked and looked and can't find any settings to leave them marked Unread. Please help!