Debian 13 is not officially supported yet I believe
Quick search resulted: https://forum.virtualmin.com/t/debian-13-and-dovecot/135899
Maybe not you’re specific problem but maybe if you search here you will find answer
Debian 13 is not officially supported yet I believe
Quick search resulted: https://forum.virtualmin.com/t/debian-13-and-dovecot/135899
Maybe not you’re specific problem but maybe if you search here you will find answer