$.ajax({
            url:https://www.yammer.com/bluefishpharma.com/api/v1/users/by_email.json?email=xendev2@mysite.com,
            headers:{accept:"application/json;odata=verbose"},
            method:"GET",
            success:OnYammerFeedSuccess,
            error:OnYammerFeedFail
});

XMLHttpRequest cannot load HYPERLINK "https://www.yammer.com/mysite.com/api/v1/users/by_email.json?email=xendev2%40mysite.com"https://www.yammer.com/mysite.com/api/v1/users/by_email.json?email=xendev2@mysite.com. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'HYPERLINK "https://mysite.sharepoint.com/"https://mysite.sharepoint.com' is therefore not allowed access