I tried this and it works. The only problem are what people stated before:
-If you reply then it will show up as @mail2web
-If you have your gmail setup as well, you can change your reply address to solve the first problem. But then you have another problem in that you will be getting duplicate email notifications...
That's why I ditched this process. I can't wait till gmail gets push. WTF are they waiting for?
If use the paid option ($4.95/month), you can make it show up as whatever email address you want when you reply. I have mine set up to look like it's coming from an optonline.net email account.