I haven't received any emails since 28/06/2024

Not enough information in your post to be able to answer directly.

First off, I have to assume you expect to have been sent some messages? A day isn't that long, and not everyone expects to get mail every day...

Second off, you haven't given any details as to what you've tried, what device(s) you're testing on, what error messages you get.

We also don't know anything about your mail provider - is this an iCloud mail account? a gmail account? a work email address? your own domain? there's a whole slew of different issues that could be at the root of the problem depending on the answer to that question alone.

So let's start with what email service provider are you using?

What device are you trying to receive mail on? Mac? iPad? iPhone? Something else?

What other devices have you tried (i.e. is it not working on all of them? just one/some of them?)

Does your mail provider have a web-based interface to Mail?

Do you see new incoming messages there?

Have you tried sending yourself mail? What happens?

Assuming you're on a Mac, have you tried Mail.app's Window -> Connection Doctor menu item? it can diagnose several common problems. What does it say?

The more detail you can provide, the better chance someone here can spot the solution.