Send email using zoho crm API

How do I send a email to a lead using Zoho CRM API?

also a side question that might be related to this - what's the <FL val="Send Notification Email">True</FL> from here:
https://zohocrmapi.wiki.zoho.com/insertRecords-Method.html#Events

can it be used for automatic sending out an email when a new Lead is added?

Thanks.