Sanity OS lets you send emails directly to a lead or contact through a smart and intuitive interface. Sending custom and 1:1 email templates are recorded for future reference in the activity time line.
Open a Lead or Contact and when they request "more info" click Select email template from the drop menu.
You will see a list of templates you have already created, select one and it will automatically send when you click save and exit.
NOTE: You may Edit the template and Send it yourself by clicking "Quick Edit" after the template is selected.
You can write a custom email just as you would from your regular email client by choosing the option "Write a New Email".