if you dont like using vi (which i can understand) - i tend to find that using the 3rd party app "Config File Editor" is a really simple way of making a few minor alterations to files without leaving the confort of the GUI (http://www.mertymade.com/syno/#cfe)
in order to edit the main.cf, all you need to do is install this app as you would do any app (through the package management thing). When you run it it will appear under the 3rd party apps on the bottom left of the GUI. On the drop down list box you will need to make a slight edit to the "config file editor" profile so it knows which file you want to edit. To include the main.cf file add "/usr/syno/mailstation/etc/main.cf, main.cf". then to enable this change go to the package installer - rerun the "config file editor" package. Next time you access the config file editor, you will see main.cf as an editable file....
reading what i just wrote, it sounds so much more difficult than it is...sorry, its probably the way i explained it!
hope it helps you?






