1.No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
解决办法:找到jdk/jre/lib/security/java.security文件进行修改 或 更新jdk版本
2.Could not connect to SMTP host: smtp., port: 25
解决办法: 修改端口号,设置ssl 禁止开启25端口,推荐使用465端口
props.put("mail.smtp.port", "465");// //设置ssl端口props.put("mail.smtp.socketFactory.port", "465");props.put("mail.smtp.socketFactory.fallback", "false");props.put("mail.smtp.ssl.enable", true);props.put("mail.smtp.socketFactory.class", ".ssl.SSLSocketFactory");