There are 2 errors in this.
1) *. I thing, there is no need of * in CNAME.
2) you should not modify
www.yourdomain.com for google app(email)
you should create CNAME mail.yourdomain.com instead of it.
otherwise what will happen, when use visits
www.yourdomain.com, he/she will be redirected to google app email page.
right now this is happened,
when anyone use www with your domain,
he/she is being redirect to google app.
but invalid (*) is there, so google app's error is displayed on that page.
So, Change it.