Insecure Transport: Mail Transmission

[QiAnXinCodeSafe]

https://github.com/XiaoMi/shepher/blob/53117572ee94c846922db9f86adb14372075f2cb/shepher-service/src/main/java/com/xiaomi/shepher/common/GeneralMailSender.java#L60-L68 Establishing an unencrypted connection to a mail server allows an attacker to carry out a man-in-the-middle attack and read all the mail transmissions. SSL/TLS connection is a better choice