I sync Zoho CRM with Zoho campaign and create list then send campaign. Now I want to update particular custom field in Zoho CRM like Email is Clicked. 

For Example I have lead in CRM that have custom filed Email info. Now I sync that contact in campaign and send email then recipient open email and clicked link in email. Now I want auto update my Custom filed - Email info --> Email Link is clicked. 

So I want to update custom field in Zoho CRM when someone click link in Email.  Please check attachment for which cusotm field i want to update.