Fetch Lead Owner Email and pass into Lead Record

I'm trying to fetch a lead owner's email address and pass it into a custom field that I created whenever a Lead Owner is created/updated.

So far, here's what I've come up with:

I've been able to grab the lead owners name and lead Owners ID but I'm still not sure how to associate the ID/Name with the Users Email address and then pass it into the lead map. Please help!

lead = zoho.crm.getRecordById("Leads",input.leadID);

leadMap=map(lead);

leadOwnerName=leadMap.get("Lead Owner");

info leadOwnerName;

leadOwnerID=leadMap.get("SMOWNERID");

info leadOwnerID;

users = getUrl((" https://crm.zoho.com/crm/private/xml/Users/getUsers?Authtoken=Auth&scope=crmapi&type=AllUsers"), false);

usersMap = users.get("responseText");

startPath = usersMap.executeXPath("/users/user");

xmlList=startPath.toXmlList();

for each r in xmlList

{

text = r.toString().executeXPath("/user/text()");

city = r.toString().executeXPath("/user/@city");

confirm = r.toString().executeXPath("/user/@confirm");

country = r.toString().executeXPath("/user/@country");

email = r.toString().executeXPath("/user/@email");

fax = r.toString().executeXPath("/user/@fax");

id = r.toString().executeXPath("/user/@id");

language = r.toString().executeXPath("/user/@language");

mobile = r.toString().executeXPath("/user/@mobile");

phone = r.toString().executeXPath("/user/@phone");

profile = r.toString().executeXPath("/user/@profile");

role = r.toString().executeXPath("/user/@role");

state = r.toString().executeXPath("/user/@state");

status = r.toString().executeXPath("/user/@status");

street = r.toString().executeXPath("/user/@street");

timezone = r.toString().executeXPath("/user/@timezone");

website = r.toString().executeXPath("/user/@website");

zip = r.toString().executeXPath("/user/@zip");

zuid = r.toString().executeXPath("/user/@zuid");

}

email = email.remove("<email><![CDATA[").remove("]]></email>");

info email;