Who said I never had to delete another email?
Few years ago I have to move around a lot carrying my notebook all the time for work and study. Since I spent very little time in the office I have no access to office emails served by Microsoft's exchange server. So I set up email rules such that incoming emails are copied to a gmail account setup solely for that purpose. I haven't logged into that account lately as I thought gmail is bottomless.
I was alerted by my colleagues that they have received bounce back from gmail saying that my mailbox is full, I don't believe that.
In fact I have more than 11,000 mails in the inbox that I have not read.