https://stackoverflow.com/questions/624581/what-is-the-best-java-email-address-validation-method
https://crunchify.com/how-to-validate-email-address-using-java-mail-api/
比较靠谱的Java验证email有效性的方法
https://stackoverflow.com/questions/624581/what-is-the-best-java-email-address-validation-method
https://crunchify.com/how-to-validate-email-address-using-java-mail-api/
比较靠谱的Java验证email有效性的方法