To email the proforma invoice to your customers or clients, follow the below-mentioned procedure. 

1. Click on the proforma invoice.
2. Right in front of the contact name, you will find various invoice options such as settings, edit, business signature, preview, print, and email. The envelope sign is the email option.
3. Click on the email button; you will find a pop-up screen in front of you. 
4. Enter the customer's email address (single or multiple) to email a proforma invoice.