that's nice to know. thanks for all your help.
about dovecot:if you have dovecot installed from the dovecot repository, then be aware that dovecot does not (yet) provide a version for bookworm. if you have dovecot installed from the debian repository, then you should be fine.about debian: read- https://www.debian.org/releases/bookworm/amd64/release-notes/ch-upgrading.en.html - https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.en.htmltwice! especially chapter 4.5 and 5. greetings...