import javax.mail.Session
import javax.mail.Message
import javax.mail.internet.MimeMessage
import javax.mail.internet.InternetAddress

@Grapes ([
  @Grab (group = 'javax.activation', module = 'activation', version = '1.1'),
  @Grab (group = 'javax.mail', module = 'mail', version = '1.4')
])

class Mailer {
  static def s_config = new ConfigSlurper ("message").parse (new File ('MailProperties.groovy').toURL ())

  static def deliverIpAddressChangeMessage(ipAddress) {
    def subject = "IP Address Changed to $ {ipAddress} "
    def message = " IP Address changed to $ {ipAddress}. \nPlease update your configurations."
    sendMail("${s _config.message.to}".toString(), "${s_config.message.from}".toString(), subject, message)
  }
  //...
}