[Failed to Send] I am shown the send email failed due to the restriction of service use
In the event of continuous spam e-mails through the Kakao Mail system, the Kakao Mail System will implement a restriction policy to prevent spam.
For further assistance with this policy or to lift of sanctions, please contact our customer service team.

To use the service safely, we recommend that you take steps such as periodically changing your password and using two-step authentication.