Checking mail on mobile data i use roaming which is very expensive and I search some kind of script or way of solving my problem: there is a possibility to turn off checking e-mail when the android is connected via mobile data ? Any knows how to limit the transfer of mobile data to the minimum (disable apps which I do not want sync etc.) ?

Thanks in advance !
If you go into Settings -> Data Usage you can see which apps are using the most data. It's possible to turn them off using data in the background by clicking on the app and then selecting "Restrict Background Data". See this and this for pictures and further detail.

Also if it's just email you're using you can probably turn it off automatically checking depending on the client and email service you're using. If you're using Gmail then go into the Gmail app, go to the settings for your account and turn off "Sync Gmail".