Nevermind. In the end I found imap_acl must be enabled in specific section
   not global like:

   protocol imap {
    # Space separated list of plugins to load (default is global
   mail_plugins).
    mail_plugins {

      imap_acl = yes

   }

   On 9/11/25 10:07 PM, Mihai Badici wrote:

     I try to configure a public folder with acl on debian trixie .

     2.4.1-4 (7d8c0e5759): /etc/dovecot/dovecot.conf
     # Pigeonhole version 2.4.1-4 (0a86619f)
     # OS: Linux 6.12.41+deb13-amd64 x86_64 Debian 13.1

     If I don't enable imap_acl there are no acl's which seems legit.

     After enabling imap_acl ( mail_plugins =    acl quota imap_acl) I can
     set acl's but I have this error:

     Fatal: Couldn't load required plugin
     /usr/lib/dovecot/modules/lib02_imap_acl_plugin.so: dlopen() failed:
     /usr/lib/dovecot/modules/lib02_imap_acl_plugin.so: undefined symbol:
     imap_list_return_flag_unregister
     I'm not sure if this can be a packaging error with the wrong version as
     it looks, a missing library or a bug... or maybe a missing parameter?
     If i run ldd on this .so there is no library missing:

     ldd /usr/lib/dovecot/modules/lib02_imap_acl_plugin.so
            linux-vdso.so.1 (0x00007fcfbfab3000)
            lib01_acl_plugin.so =>
     /usr/lib/dovecot/modules/lib01_acl_plugin.so (0x00007fcfbfa8a000)
            libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fcfbf88b000)
            /lib64/ld-linux-x86-64.so.2 (0x00007fcfbfab5000)

     Thanks,

     Mihai Badici
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