Mailbox full on plesk 7.5.3 on Centos 3.4

[xant]

I have this problem

Hi. This is the qmail-send program at linux1.domain.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<[email protected]>:
Recipient's mailbox is full, message returned to sender. (#5.2.2)

HELP ME PLEASE

 

[superbock]

Lol. Here's a tip: open your eyes!