Usually JavaMail API is used. In your project you can wrap it in your own Scala library or use existing one. Here is an example of using existing Mailer
API in Lift framework:
package code
package config
import javax.mail.{Authenticator, PasswordAuthentication}
import javax.mail.internet.MimeMessage
import net.liftweb._
import common._
import util._
/*
* A Mailer config object that uses Props and auto configures for gmail
* if detected.
*/
object SmtpMailer extends Loggable {
def init(): Unit = {
var isAuth = Props.get("mail.smtp.auth", "false").toBoolean
Mailer.customProperties = Props.get("mail.smtp.host", "localhost") match {
case "smtp.gmail.com" => // auto configure for gmail
isAuth = true
Map(
"mail.smtp.host" -> "smtp.gmail.com",
"mail.smtp.port" -> "587",
"mail.smtp.auth" -> "true",
"mail.smtp.starttls.enable" -> "true"
)
case h => Map(
"mail.smtp.host" -> h,
"mail.smtp.port" -> Props.get("mail.smtp.port", "25"),
"mail.smtp.auth" -> isAuth.toString
)
}
//Mailer.devModeSend.default.set((m : MimeMessage) => logger.info("Sending Mime Message: "+m))
if (isAuth) {
(Props.get("mail.smtp.user"), Props.get("mail.smtp.pass")) match {
case (Full(username), Full(password)) =>
logger.info("Smtp user: %s".format(username))
logger.info("Smtp password length: %s".format(password.length))
Mailer.authenticator = Full(new Authenticator() {
override def getPasswordAuthentication = new
PasswordAuthentication(username, password)
})
logger.info("SmtpMailer inited")
case _ => logger.error("Username/password not supplied for Mailer.")
}
}
}
}
Many web frameworks would implement conveniece methods for you to deal with mime types, attachments, etc.
Needless to say that sending email is never 100% reliable. It's more like fire and forget operation. There is no confirmation or error propagation in mail protocols by default which is usually accepted as normal.
If you use SMTP mail sender you can connect it to any mail server whether it's an external one like gmail, or locally installed postfix.