SysMailerMessageBuilder mailer = new SysMailerMessageBuilder();
SysMailerSMTP smtp = new SysMailerSMTP();
mailer.setSubject('Test');
mailer.setFrom("邮箱");
mailer.setBody('body');
mailer.addTo('发送至邮箱');
//mailer.addAttachment(memoryStream,"库存快照"+number+".xlsx");
smtp.sendNonInteractive(mailer.getMessage());