2 if I comment user_global_uid = 1000 user_global_gid = 1000 dovecot can't get uidnumber from ldap, in spite of its presence in ldap entry :'o(

You have to specify in your user_attrs which parameters give the uidnomber and the gidnumber in your ldap directory:

User attributes in order:

Virtual user name (user@domain)

Home directory

MAIL environment

System user name (for getting user's groups from /etc/group)

- For virtual users you don't want to use this, so this defaults to

none.

System UID

System GID

#user_attrs = uid,homeDirectory,,,uidNumber,gidNumber