> On 6 Aug 2018, at 8.26, Aki Tuomi <aki.tu...@dovecot.fi> wrote:
> 
> You could do
> 
> userdb {
>    driver = username_format=%Lu passwd-file
>    args = /etc/dovecot/share.passwd
> }
> 
> #  /etc/dovecot/share.passwd
> t...@onnet.ch <mailto:t...@onnet.ch>::::::: 
> userdb_acl=vfile:/etc/dovecot/dovecot-acl userdb_acl_globals_only = yes
> 
> should prevent the user from modifying any ACL files. 
> 

close, but few typos. userdb should be:

userdb {
  driver = passwd-file
  args = username_format=%Lu /etc/dovecot/share.passwd
}

Sami


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