HOW CAN I SOLVE THIS PROBLEM

HOW CAN I SOLVE THIS PROBLEM

Good morning, I'm getting this message and I can not send emails to my clients.
How can I solve this problem?
Dear User,

Saída de emails bloqueada. Motivo:Mail rate exceeded limit

However, we realize that this might have been unintentional. To unblock, please click here.

Thanks,
Zoho Mail Team

P.S.: This is an auto-generated message. Please do not reply to this email.