Trying to send email but get 'Unusual sending activity detected. Please try again after some time'

Trying to send email but get 'Unusual sending activity detected. Please try again after some time'

We use Zoho mails to send password reset emails, welcome emails and user verificaion emails automatically. Please unblock the account so we can continue to use your service.

We are currently testing our APIs and have no way to proceed with the tests.

Thank you.