Now these days many website users are using the gmail app client as their mailing client. Due to the user friendly working of gmail. On the other side if we use Roundcube, Squirrel Mail its tricky for a new comer. So here i am putting the cPanel MX Entry for Google APPS, Gmail APP to integrate gmail client with your mail.
If you want your domain to redirect to google app than make a cname entry for this. Suppose we are making it for mail.domain.com than we have to create a cname entry for mail.
mail -> ghs.googlehosted.com.
create this entry in your advanced dns editor and create an entry in your google app for custom url. It will work for you.