Hello, i'm aware that there are plenty 'Roundcube' threads on this forum, but i didn't find any that could solve my problem. The problem is sending nor receiving emails doesn't work. When i try to send an email it says 'sent successfully', but it never reaches the recipient's mailbox and vice-versa - sending an email to this account shows no results. But no errors are displayed. I have ISPConfig3 installed on my VPS (running Ubuntu 14.04). I used this howtoforge.com/using-roundcube webmail-with-ispconfig-3-on-debian-wheezy-apache2 tutorial to install Roundcube and it didn't work out for me as i wanted. Roundcube is installed, i can access it via mydomain.com/webmail/ address and log in using the username and password created in ISPConfig3. I tried to fix it by removing the Roundcube package and installing it once again, but i probably screwed up. I have a guess that it might have something to do with creating user accounts in ISPConfig3 - in the email -> domain -> add new domain tab i don't have a choice of a client - just an empty list, but that's just a guess. I will be grateful for some help.