New Post: GetUserInfo Using PreferredName

Hello, I'd like to use GetUserInfo to retrieve the WorkEmail of a user form Active Directory. The GetUserInfo function below looks up the user by the accountName. Is it possible to get the WorkEmail from AD using the PreferredName? The only information provided to my page is the user's name.

var $email;

$.SPServices({
    operation: "GetUserInfo",
    userLoginName: "SHARE1\\user",
    completefunc: function (xData, Status) {
        $(xData.responseXML).find("User").each(function() {
            $email = $(this).attr("Email");
            alert($email);
    }
});