After I exceeded my quota, 30min ago, I got a message like 'impossible to send mails'
So I went to the recycle bin and emptied it and now I have more than 500MB available space, but still:

host[] said: 552 5.2.2 user quota
exceeded (UserSearch) (in reply to RCPT TO command)

This is what I receive when I try to send an email to my mail (based on zimbra).

What to do? is it a zimbra problem or problem?