I have a VPS. I installed postfix, dovecot, squirrelmail from guide- i try with 3 guides. Postfix is normally run. I installed squirrelmail but when i must enter in my-website/webmail I don't have windows to log in squirrelmail but white page. I previously tried install postfixadmin and was the same- white page. I don't know where is problem. Please help.
I didn't install ispconfig, before my friend maybe installed, but he doesn't have time at now. How can i check version ispconfig?
You dont ned ispconfig and it wont work anyway on a server were you installed postfixadmin before without reinstalling the system. you wrote that you followed a tutorial to install your server, which tutorial was that?