具体报错：
AuthenticationFailedException: 535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/?p=BadCredentials o19sm9099443pjr.2 - gsmtp
具体解决方法：
登录gmail生成应用密码，配置到jira email password。
延伸阅读：
https://community.atlassian.com/t5/Jira-questions/Using-Gmail-as-a-JIRA-Mail-Server/qaq-p/824782
原文：https://www.cnblogs.com/ccielife/p/12401373.html