How can I disable the automatic creation of subdomains?

My server has OpenLiteSpeed 1.7.16 and Cyberpanel 2.3.3 installed.
When installing Cyberpanel I refused to install PowerDns, Postfix and Dovecot. However, something on my server has created mail subdomains on all sites without my knowledge. All mail subdomains were issued with letsencrypt certificates. How can I remove the subdomains and prevent automatic creation of mail subdomains in the future?

Unfortunately you can prevent its creation.

I will add the check that if email server is not installed, this should not happen.

Thank you. I look forward to the implementation of this feature.

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