I gave up and accept this as the normal standard. I just delete it and move on. Also gave up on “inbox 0.” That’s an unattainable goal. Better luck putting my self on the moon.
Whenever I have an issue with inbox 0, it is because I don't have a procedure in place for how to deal with a given email.
Stupid marketing emails are the easiest to deal with - the entire required procedure is to archive them.
Emails that are complex and require a lot more though, have multiple decisions and/or holders of stakes involved are currently the bane of my existence.
I setup a wildcard for my domain and then use promos.Company@mydomain for anything new I sign up for which makes it manageable. Plenty goes to my promotional wildcard, odd things to the wild wildcard (junked), and only important direct emails go to my actual inbox.
I have literally 10 emails just from my own Google Calendar reminding me to do things, 6 from HN replies, some from GitHub, some reminders for financial statements, and lots of miscellaneous notifications and mailing list emails... how in the world do you only get 10 emails per day when running a business?
You'd be surprised how much this underlying root cause is the source of so many online arguments over who is "right".
It's amazing how many people seem to think that the words on the screen are someone just down the road living a life virtually similar to theirs and not sitting in a country where holding hands is illegal in public and people get stoned to death in public.