blocked email,please help!!!

blocked email,please help!!!

Even after deleting emails and taking the account to under 4 GB emails are still being blocked. Please HELP
552 5.1.1 < magdalena.stojanov@ea.co.rs> Mailbox delivery failure policy error


Final-Recipient: rfc822; magdalena.stojanov@ea.co.rs
Action: failed
Status: 5.1.1
Remote-MTA: dns; mx.zohomail.com. (204.141.42.121, the server for the domain ea.co.rs.)
Diagnostic-Code: smtp; 552 5.1.1 < magdalena.stojanov@ea.co.rs> Mailbox delivery failure policy error
Last-Attempt-Date: Tue, 27 Feb 2018 02:21:31 -0800 (PST)