I do the same. I use Yahoo as my email. You have to go into the settings of your email..like Yahoo for example. So, open your email on your phone, click menu (bottom left corner of your phone, on your actual phone....took me a bit to learn that). Tap MORE, choose Account Settings, Email check frequency. I have yahoo customized for every hour....

 

I too prefer the Infuses built in email app for reading my gmail. Sure the new-mail notifications don't roll is as instantly as the gmail app but that's ok the Infuse mail's pretty (white letters on black -vs- gmail's black on white).

In the Infuse mail menu, I set it to check for new mail every five minutes. I even froze the gmail app with Gemini to be done with it and that keeps me from getting double notices and checking the same mail box twice.