I've been running my ISP provided POP email though google for some time now. Rather than instruct google to get the POP mail, I went direct to the ISP web interface and configured it to forward mail to my google account. Then I set up google like you did to reply with my POP address. I forget which one does it, but one service strips (or omits) the POP forwarding so the mail arrives directly to google just like if it had been sent to that address directly. The advantage to doing things this way (if your ISP allows) is that there is no 15 minute wait for google to poll your ISP. When mail hits your ISP, it is automatically forwarded to google, which pushes it directly to your phone.
quote]
I don't mind waiting 15 minutes for an email. It's only my AOL mail that I use for emails that I don't want coming to or going from my gmail. Maybe if I figure it out, I'll try it your way, but it's not really that necessary as I've had the mail app polling for it every 4 hours.