Please unblock mine email from sending emails - It says "Unable to send message;Reason:550 5.4.6 Mail rate exceeded limit"

Email: seo@serpwizard.com

I am sending emails to our clients.

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I have already unblocked it still cannot send emails.

This is what you sent me to unblock it -

Dear User,

Mail Outgoing blocked. Reason :Mail rate exceeded limit

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