When migrating #dovecot to a new server running #debian #trixie, no one told me that with dovecot 2.4.0 basically the whole configuration logic changed and that you need to completely re-write your config.
@Billie Ouch! And such "breaking change" was not warned about?!? Oof…
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When upgrading you get warned. When you do a fresh install probably not, as there are no old configs anyway.
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See https://salsa.debian.org/debian/dovecot/-/blob/master/debian/dovecot-core.NEWS?ref_type=heads#L1
debian/dovecot-core.NEWS · master · Debian / dovecot · GitLab

Secure POP3/IMAP server

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