I try to keep my inBox free. I save the emails I want to keep in special folders on my Mac.
I have a lot of those special folders, and it's been a pain in the wrist to scroll, tap, repeat. I keep almost all incoming email folderized, except for few that does not belong anywhere, which gets archived in a specific folder corresponding to a year. It's extremely easy to do this on Outlook or desktop apps, sadly no such a thing exists on iOS.
I tried Altamail, which was excellent, however their notifications do not work on iOS.
I guess the userbase of this forum is mainly leisure users, app addicts/social media, casual email communicators. Is there a forum where business professionals who get over 100 emails a day gather and discuss options to make use of their iphone? I gather most people just read the email and let it go, don't do much of a responding or replying back, unless it is a text message.