问题出现原因：配置了身份校验，而这个邮件服务器是内网中的邮件服务器，无需身份校验即可发送邮件。邮件服务器也没有提供相应的身份验证方法，因此报错。
解决办法：去除SMTP协议中的身份校验 mail.smtp.auth 设定为false ，并将密码设定为null。
//props.put("mail.smtp.auth", "true");//注释后默认为false transport.connect(host, from, null);//默认设置为null
javax.mail.AuthenticationFailedException: No authentication mechansims supported by both server and client
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