Getting an email every time someone posts something on a Facebook group really stinks. But you can make it go away, and Facebook has even made the process easier.
From your page, find the little arrow with no name (no, I don't know why they do this), click on it and select *Account Settings*
From that page, look over at the left for *Notifications*. Did I mention that this is simplified?
From that page, select Email Frequency. I did this a couple of months ago and it stopped the Facebook emails!
And there you go!