title.gettext restricted to local domain and subscribers

is_subscriber([listname],[sender]) smtp,md5,smime  -> do_it
is_editor([listname],[sender])     smtp,md5,smime  -> do_it
is_owner([listname],[sender])      smtp,md5,smime  -> do_it
match([sender],/[domain]$/)        smtp,md5,smime  -> do_it
true()                             smtp,md5,smime  -> reject(reason='send_local_user_sub')
