<bean id="javaMailSession" class="org.springframework.jndi.JndiObjectFactoryBean">
    <property name="jndiName" value="java:comp/env/mail/Session"/>
</bean>

<bean id="javaMailSenderImpl" class="org.springframework.mail.javamail.JavaMailSenderImpl">
    <property name="session" ref="javaMailSession"/>
</bean>