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+.TP
+.B \-A
+If the
+.B \-A
+option is present, the
+.I command
+will be performed for all users.
+Using this option in combination with system users from
+.B userdb { driver = passwd }
+is not recommended, because it contains also users with a lower UID than
+the one configured with the
+.I first_valid_uid
+setting.
+.sp
+When the SQL userdb module is used make sure that the
+.I iterate_query
+setting in
+.I @pkgsysconfdir@/dovecot\-sql.conf.ext
+matches your database layout.
+When using the LDAP userdb module, make sure that the
+.IR iterate_attrs " and " iterate_filter
+settings in
+.I @pkgsysconfdir@/dovecot-ldap.conf.ext
+match your LDAP schema.
+Otherwise
+.BR doveadm (1)
+will be unable to iterate over all users.