[Dovecot] Question about Dovecot-ACLs

Hi there,

i try to create an php-script to control acl's for public folders without file-manipulation.

For this i use imap_setacl() like this example: imap_setacl($mbox,"INBOX/test", "email@domain.tld", "lrwstipekxa");

The acl-file looks so: ~:> cat dovecot-acl user=email@domain.tld akxeilprwts

But i have a problem with the follow function: imap_setacl($mbox,"INBOX/test", "email@domain.tld", "");

This command only delete the rights from the email, not the whole entry in my dovecot-acl file.

Now my acl-file looks like this: ~:> cat dovecot-acl user=email@domain.tld

Did this affect dovecot by any way?

Thanks, Jan