@Nanxing0 A lot of people seem not to deal with their email in a way that makes much sense. I've had people say they never received my email, when it simply got shunted to their Spam box, because they didn't have my email address in their address list. When I ask if they checked their Spam box, they find it there, then say they never, ever look at it. I always look at it, because I have found perfectly legitimate emails there that I needed to respond to, then I just delete the junk. Same with email inboxes- I have a friend who hardly ever answers emails- she claims she didn't see them. I figured out why- I was sitting with her one day when she was checking her email and it said "You have 1,200 unread emails"! I asked her what was up with that and she said most were just junk. I asked why she didn't just delete them each day as she received them, if they were junk, because the real emails from friends were getting lost in the list. She had no reason, she just didn't bother.
I have a whole list of folders I shunt each email into that I want to save, so I can find them easily if I need to, not hunt back through 100 pages of emails to try to find what I'm looking for. I delete the ones that are garbage, and so all that's usually in my Inbox are emails I need to respond to.
It makes me feel stressed if I don't keep things like that organized, but lots of people aren't like that at all.