Send an email via an R function using Mailgun

send_email_mailgun.R

#' Email a user a report is ready
#'
#' Requires an account at Mailgun: https://mailgun.com
#' Pre-verification can only send to a whitelist of emails you configure
#'
#' @param email Email to send to
#' @param mail_message Any extra info
#'
#' @return TRUE if successful email sent
#' @import httr
#' @export
sendEmail <- function(email = "XXXXX@you.com",
                      mail_message = "Hello"){

  url <- "https://api.mailgun.net/v3/sandbox5f2XXXXXXXa.mailgun.org/messages"
  ## username:password so api_key is all after the api:
  api_key <- "key-c5957XXXXXXXXXXXbb9cf8ce"
  the_body <-
    list(
      from="Mailgun Sandbox <postmaster@sandbox5XXXXXXXXa.mailgun.org>",
      to=email,
      subject="Mailgun from R",
      text=mail_message
    )

  req <- httr::POST(url,
                    httr::authenticate("api", api_key),
                    encode = "form",
                    body = the_body)

  httr::stop_for_status(req)
  
  TRUE

}

Sorry I missed your comment @laresbernardo, they only just started sending notifications.