well, as I received today another petition about "I cannot see my mails" and had one guy who had 800 in his inbox and the same problem a few weeks ago, and now this one had 1000 mails there...
I decided to regulate that.
You can now have 200 mails in your inbox ... after that, nobody (except a superuser who might need to) can send you mails.
You will be notified if you have only 10% space left in your mailbox there. Then you will see how many mails you can receive.
Also, now, if you have over 200, you will see how many you need to delete in order to receive new mail.