chinese version：

http://www.javaarm.com/faces/display.xhtml?tid=2383

or

https://community.jboss.org/wiki/JBossAS720EmailSession-ChineseVersion

This article introduces how to configure email session in JBoss AS 7.2.0. Here, we use gmail smtp. I summarized many articles and corrected some errors.

1. configure mail session and smtp in standalone.xml

        <subsystem xmlns="urn:jboss:domain:mail:1.1">
            <mail-session jndi-name="java:/Mail" from="javaarm@gmail.com">
                <smtp-server ssl="true" outbound-socket-binding-ref="mail-smtp-gmail">
                    <login name="javaarm@gmail.com" password="your_password"/>
                </smtp-server>
            </mail-session>
            <mail-session jndi-name="java:/OtherMailSession" from="javaarm@gmail.com">
                <smtp-server ssl="true" outbound-socket-binding-ref="mail-smtp-gmail">
                    <login name="javaarm@gmail.com" password="your_password"/>
                </smtp-server>
            </mail-session>        

</subsystem>

        <outbound-socket-binding name="mail-smtp-gmail">
            <remote-destination host="smtp.gmail.com" port="465"/>
        </outbound-socket-binding>

2. Java code of getting Mail Session and sending email

2.1 method.1: Resource injection

@Local(IEmailService.class)
@Singleton
@Startup
public class EmailService implements IEmailService{
    public static final Logger log = Logger.getLogger(EmailService.class.getName());
    public static final String EMAIL_SESSION_JNDI_PATH = "java:/Mail";
    
    @PersistenceContext
    private EntityManager em;
    
    @Resource(name = "java:/Mail")
    private Session mailSession;


 @Resource(name = "java:/OtherMailSession")
    private Session otherSession;
    
    
    @PostConstruct
    public void start() throws Exception {
    }

    @PreDestroy
    public void destroy(){
    }
    
    //*****************[interface methods]***************//
    @Override
    @PermitAll()
    public boolean sendMail(Email email){
        try{
            MimeMessage m = new MimeMessage(getEmailSession());
            InternetAddress[] to = new InternetAddress[] {
                    new InternetAddress(email.getToUser().getEmail()),
                    new InternetAddress("javaarm@gmail.com")//备份一份！
            };
            m.setRecipients(Message.RecipientType.TO, to);
            m.setSubject(email.getTitle());
            m.setSentDate(new java.util.Date());
            m.setText(email.getContent(), "utf-8", "html");
            //
            Transport.send(m);
            //
            return true;
        }catch(Exception e){
            e.printStackTrace();
            return false;
        }
    }
    
    private Session getEmailSession() throws Exception{
        return mailSession;
    }
}

2.2 method.2: JNDI look up

change above getEmailSession() method to:

    private Session getEmailSession() throws Exception{
        InitialContext context = new InitialContext();
        return (Session) context.lookup(EMAIL_SESSION_JNDI_PATH);
    }

Questions:   If My application in jboss is critical and I have 3 backing email server, how to use them?

Answer: You can configure multiple mail sessions in mail subsystem and inject/lookup ones you need, or you can use JCA.

Refrences:

https://community.jboss.org/thread/176988

https://community.jboss.org/message/783617?tstart=0&_sscc=t

http://middlewaremagic.com/jboss/?p=940

http://www.mastertheboss.com/jboss-configuration/jboss-mail-service-configuration

https://community.jboss.org/thread/231210

jboss-as-7.2.0.Final\docs\schema\jboss-as-mail_1_1.xsd