ScalaでGmail

gmail.scala

import java.util.{Date, Properties}
import javax.mail._
import javax.mail.internet._
   
val host = "smtp.gmail.com"
val username = "your_mail_address at gmail.com"
val password = "your_password"
   
val props: Properties = System.getProperties
props.put("mail.smtps.auth", "true")
   
val session: Session = Session.getInstance(props, null)
val msg = new MimeMessage(session)

msg.setRecipients(Message.RecipientType.TO,
                  "recipient at gmail.com")
msg.setSubject("From Scala To You!")
msg.setSentDate(new Date)
msg.setText("すから!!\n")

val t: Transport = session.getTransport("smtps")
try {
  t.connect(host, username, password)
  t.sendMessage(msg, msg.getAllRecipients)
} finally {
  t.close()
}

Do I have to include an external library to get access to javax.mail?