sending-html-mail-with-sendmailR

res <- sendmail(from="{my_gmail_account}",
                to='[email protected]', 
                subject='Test', 
                msg=doc, 
                headers=list(`Content-Type` = "text/html; charset=\"utf-8\""),
                smtp = list(host.name = "smtp.gmail.com", port = 465,
                            ssl=TRUE, user.name = "{my_gmail_account}",
                            passwd = "{my_gmail_password}"))