Letter of recommendation from employer for MS in U.S. universities Is a letter of recommendation from an employer required to be on the official letter head of the company? 

Also is it okay if I give the recommender's personal email?
Nothing in particular is required for a company letter of recommendation.  Pretty much any established company will have some sort of letterhead, though, and your recommender using it will feel more "professional."  Likewise with corporate vs. personal email addresses.