Hi Tun,
You could achieve your custom mail producer by implement the org.jbpm.pvm.internal.email.spi.MailProducer.
org.jbpm.pvm.internal.email.spi.MailProducer.
You could find more information in developer guide.
http://docs.jboss.com/jbpm/v4/devguide/html_single/#custommailproducers
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