202109032025 更新图片和说明

Author: coderdream

README.md

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 ## 项目4：spring-javamail-practice
 
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+ ![](https://raw.githubusercontent.com/CoderDream/java-architect-util/main/images/mailwithpicture.jpg)
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 ###  参考文档
 
 - [使用Spring JavaMailSender发送邮件](https://www.jianshu.com/p/ef7c24dde787)