Send a trigger/webhook to Zoho Flow when I send a Lead in Zoho an email

Send a trigger/webhook to Zoho Flow when I send a Lead in Zoho an email

Hi, I want to close out all tasks on a lead when an email within Zoho is sent to that lead. But I can't figure out how I can use sending an email to a lead within Zoho as a trigger.  Is  there a way for me to send a trigger/webhook to Zoho Flow when an email is sent to a lead? Any other way that this can be accomplished?