Severe Email Issue since last update a couple days ago - 3.4.0.beta4-dev

this shows up a lot in the production log:

Email can not be processed: Email::Receiver::EmptyEmailError

tail -1000 production.log-20250202 | grep ‘Email::Receiver::EmptyEmailError’ | wc -l
291

I see this topic, but don’t understand the solution, anyone can explain it to me please? Like where is the inbox located? I can see my inbox if I click on messages twice for my account, and can delete those messages, but there are not many. So, I mean how do I see all the incoming reply emails, which inbox, etc