Email using REST API into SharePoint

EmailFrmSharePoint.js

console.log("Email");

function sendEmail(from, to, body, subject) {
    //Get the relative url of the site
    var d = $.Deferred();
    
    var siteurl = _spPageContextInfo.webServerRelativeUrl;
    var urlTemplate = siteurl + "/_api/SP.Utilities.Utility.SendEmail";
    $.ajax({
        contentType: 'application/json',
        url: urlTemplate,
        type: "POST",
        data: JSON.stringify({
            'properties': {
                '__metadata': {
                    'type': 'SP.Utilities.EmailProperties'
                },
                'From': from,
                'To': {
                    'results': [to]
                },
                'Body': body,
                'Subject': subject
            }
        }),
        headers: {
            "Accept": "application/json;odata=verbose",
            "content-type": "application/json;odata=verbose",
            "X-RequestDigest": jQuery("#__REQUESTDIGEST").val()
        },
        success: function(data) {

            d.resolve();
        },
        error: function(err) {
            console.log('Error in sending Email: ' + JSON.stringify(err));
            d.reject();
        }
    });
    
    return d.promise();
}
/*
$(document).ready(function () {

	var from = 'rgupta@unicef.org',
        to = 'rgupta@unicef.org',
        body = $("BODY").html(),
        subject = 'Test Email By REST API';
	
    var p = sendEmail(from, to, body, subject);
    $.when(p).then(function(){
       console.log('Email Sent Successfully :)');
    });

});
*/