Locked outbox - I know why but please unblock it

Locked outbox - I know why but please unblock it

By mistake we had the newsletter sent by our webshop from the Zoho mailbox, from the address kontakt@debinkapodlogi.pl

We have been blocked from sending emails from the mailbox. 
We would like to ask you to remove the blockade and ensure that it does not happen again. 

Sincerely,
Debinka