Make sure you've properly edited (see comments in bold) the following section in applicationContext-service.xml file as too:
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="host" value="${mail.host}"/>
<property name="defaultEncoding" value="UTF-8"/>
<!-- Uncomment if you need to authenticate with your SMTP Server -->
<!--property name="username" value="${mail.username}"/>
<property name="password" value="${mail.password}"/>
<property name="javaMailProperties">
<value>
mail.smtp.auth=true
</value>
</property-->
</bean>
hope that helps.