Merge remote-tracking branch 'origin/master'

4dkankan-utils-email/README.md

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+### 注意
+发送html文件使用spring Thymeleaf 模板引擎
+### 配置例：
+spring.mail.host=smtp.exmail.qq.com
+spring.mail.port=465
+spring.mail.username=4Dkankan@4dage.com
+spring.mail.password=
+spring.mail.properties.mail.socketFactory.port=465
+spring.mail.properties.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory