ERROR_CODE :554, ERROR_CODE : 5.1.8 Sender Address Blocked

ERROR_CODE :554, ERROR_CODE : 5.1.8 Sender Address Blocked

Dear Zoho-Team,

yesterday I got this error message and since then I don't get any mails - neither to my zoho-mailbox nor to mailboxes connected to the zoho mailbox. Can you please do something about it? My email is: (deleted due to security reasons)

And I assume I got important and maybe urgent mails since that time. Are they lost now? :(

Thank you in advance 
Viktorija