感谢原作者，我查看到的帖子地址是：http://www.pooy.net/dedecms-set-mail-sending-problems.html

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">  
        <property name="host" value="smtp.qq.com" />
        <property name="port" value="25" />
        <property name="username" value="***@bjnja.com" />
        <property name="password" value="****" />  
              
        <property name="javaMailProperties">
             <props>
                 <prop key="mail.smtp.auth">true</prop>
             </props>
        </property> 
    </bean>

Spring配置为

最后记录本次邮件发送的代码

/**
* 发送HTML信息并有附件的邮件. <br>
*/
public void sendAttachMessage(String toAddr, String fromAddr,
String subject, String conText, boolean isHtml,
List<File> inLineImgs, List<File> attachments) {
final ApplicationContext context = new ClassPathXmlApplicationContext(
new String[] { "com/mail/applicationContext.xml" });
JavaMailSender sender = (JavaMailSender) context.getBean("mailSender");

try {
JavaMailSenderImpl senderImpl = new JavaMailSenderImpl();
MimeMessage mailMessage = senderImpl.createMimeMessage();
MimeMessageHelper messageHelper = new MimeMessageHelper(
mailMessage, true, "utf-8");

messageHelper.setTo(toAddr);
messageHelper.setFrom(fromAddr);
messageHelper.setSubject(subject);
messageHelper.setText(conText, isHtml);

// 附图
for (File file : inLineImgs) {
messageHelper.addInline(MimeUtility.encodeWord(file.getName()),
file);
}
// 附件内容
for (File file : attachments) {
messageHelper.addAttachment(MimeUtility.encodeWord(file
.getName()), file);
}
sender.send(mailMessage);
} catch (Exception e) {
throw new RuntimeException(e);
}
}