send.mail(from = "sender@gmail.com",
          to = c("recipient1@gmail.com", "Recipient 2 <recipient2@gmail.com>"),
          replyTo = c("Reply to someone else <someone.else@gmail.com>")
          subject = "Subject of the email",
          body = "Body of the email",
          smtp = list(host.name = "smtp.gmail.com", port = 465, user.name = "gmail_username", passwd = "password", ssl = TRUE),
          authenticate = TRUE,
          send = TRUE)