Thanks for the email sketch SurferTim, I didn't know it was on the Playground.
I have already a working webpage. So my DHCP and gateway are already working.
I also update to ThingSpeak.com so I had already a 'client' class declared. I used the same 'client' class and added the part that sends the email. The SMTP server I used is the one supplied by my internet provider, which has no passord or encryption, they only check the IP to see if I am one of their clients. It worked right the first time. Thanks!
My webpage on the Arduino has a button and a form, which I use now to send an email.