I have installed ISPConfig 3 as DNS server and web server and also mail server. All installed correctly. I use CentOS 5.5 32 bit and ISPConfig 18.104.22.168 I have created email domain with name domain.tld and also created email mailbox with name firstname.lastname@example.org The problem is when I use the squirellmail webmail, I have to input "email@example.com" as the username. I access the webmail through : www.domain.tld/webmail Is this normal? Can I use just "client1" as username for all user mailbox? Is there any way to do this? One more thing, I installed ntp in my server for synchronizing clock. But I notice that sometimes the server clock will change and this caused the dovecot to kill itself. This happens frequently in interval a week or less. Is there something that I can do to avoid this? Or I'll just have to kill ntp?