lotvic is right , regardless of what email program or browser you use , one way or another a spammer or a spam bot program will get you , I know its a pain in the butt , I use mozilla thunderbird email , you can have as many email accounts as you want on it.
I have a bt email address as well as a gmail address on it , my gmail was getting 20 junk hits a day so I made a second gmail address , even before I used the new one I got 10 junk in 1 day.
An obvious spam email is one that appears as sent from you to you think about it !
As an extra security against spam if I see an odd subject line from somebody I know I ring them up , this once saved me from grief as the person said they had not sent me anything.
Me and the wife don't have separate user accounts but we do say to each other are you supposed to be getting an email from xyz about subject xyz.
FINALLY , don't use a spare pc to open emails you are curious about because as lotvic said you will be sending a signal back that your email address really does exist.