sendMail question

I have a field called input.Stakeholders in the active form. It's selecting the names of stakeholders from "New Stakeholder" via a lookup. I wish to get the email addresses associated and map them to the "to" field in the sendmail function. Any help is greatly appreciated.

if(input.Job_Status == "Shipped")

{

sendmail

[

from:zoho.adminuserid

to:(NEED HELP)

subject:"Job: " + input.Job_ + " has been shipped!"

message: "test"

content type:HTML

]

}