I'm new with Linux also ISPConfig. But my 2 Platformes working well (1 Nextcloud also 1 Wordpress). Now my Problem is in Roundcube: - My First "Testmail" was working. But after i tried to send a mail to an External Mail Adress (of me) i only have on roundcube (after pressing send mail) a # in my URL and Nothing is Working. It don't start to "sending E-Mail" or something. It just do Nothing after adding the # on URL. Roundcube Version: Roundcube Webmail 1.3.6 ISPConfig Version: ISPConfig Version: 3.1dev PHP Version: 7.2.24-0ubuntu0.18.04.1 OS: Ubuntu 18.04 Thank you for your Assistance!