550 5.4.6 Mail rate exceeded limit

550 5.4.6 Mail rate exceeded limit

Dear support,

We can not send mail from this address for some time: se@ader.mg, the following error continues,
then we have not to send several mails :

550 5.4.6 Mail rate exceeded limit. <a href=https://mail.zoho.com/UnblockMe target=_blank>Click here</a> to unblock.

please unlock our account.

We thank you in advance for your response.

Regards,
Thierry