I would suggest looking in the settings of the Email application itself.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
I tried that. I went to Settings_Manage applications-Y! Mail -It shows Hardware controls...Control vibrator... but you can not "click" on it to turn it off. I tried hitting the "hard button" menu, but nothing comes up.
I tried that but it still vibrated when the emails came in. Even the guy at the Verizon kiosk in Costco only knew about that so I thought we had it licked until about 10 min later and bzzzt bzzzt!! Aaaargh!!!