well I removed the http:// bit and it did something but who know what.
seems that this lpadmin administers the server and I thought would inform client.
not working but there is a more urgent problem in that weirdly after typing.
php seems to have stopped working on server so no mail server
just displays the text.
there is error in apache2 error log
[php7:error] [pid 5733] [client 10.0.0.101:53579
] PHP Fatal error: Uncaught Error: Class 'DOMDocument' not found in /usr/share/roundcubemail-1.3.8/program/lib/Roundcube/html.php:357\nStack trace:\n#0
so I don't know what goes on.