Outgoing blocked

HELLO

Please help we have blocked outgoing and mail "However, we realize that this might have been unintentional. To unblock, please click here." we click and nothing we can do we have info :

Your account biuro@aquamelior.pl has been blocked due to security reasons.

Block Type: Szybkość wysyłania wiadomości przekroczyła limit"

What is going on? We even haven't been sending mails in this hour could you chceck it? It seems like some issue again. We can't contact with our clients please help us ASAP