Daily Mail Size Quota Exceeds Limit

Daily Mail Size Quota Exceeds Limit

I receive a mail with the next message:

User :  administracion@plastienvase.com.py
Details :Correo entrante bloqueado. Motivo:Daily Mail Size Quota Exceeds Limit. Mail Fetch has also been disabled for any active POP accounts. 

What can i do for unblock the mail account?