problem with my mailbox

problem with my mailbox

Guys, my mailbox is 40% utilization normally and suddenly burst into 938% today, this is wrong, should be some zoho mail error.

Please see urgently.

User : juniorsilva@meganet.com.vc 
Details :MailBox Size Exceeds Limit [MailBox Size=48,193]. Mail Fetch has also been disabled for any active POP accounts. 

regards