public class TestLog4jSendMail {
static Logger logger = Logger.getLogger(TestLog4jSendMail.class);
SMTPAppender appender = new SMTPAppender();

public TestLog4jSendMail() {
    try {
        appender.setSMTPUsername("yin_jw123@126.com");
        appender.setSMTPPassword("yinjianwei");
        appender.setTo("yin_jw456@126.com");
        appender.setFrom("yin_jw123@126.com");
        // SMTP服务器 smtp.163.com
        appender.setSMTPHost("smtp.126.com");
        appender.setLocationInfo(true);
        appender.setSubject("Test Mail From Log4J");
        appender.setLayout(new PatternLayout());
        appender.activateOptions();
        logger.addAppender(appender);
        logger.error("Hello World");
    } catch (Exception e) {
        e.printStackTrace();
        logger.info("Printing ERROR Statements", e);
    }
}

public static void main(String args[]) {
    new TestLog4jSendMail();
}

}
上面的代码可以发送邮件

调用log4j.properties文件不能发送邮件
###########################send error through email.###########################

log4j.appender.MAIL=org.apache.log4j.net.SMTPAppender

日志的错误级别

log4j.appender.MAIL.Threshold=ERROR

缓存文件大小，日志达到512K时发送Email

log4j.appender.MAIL.BufferSize=0

发送邮件的服务器

log4j.appender.MAIL.SMTPHost=smtp.126.com
#邮件主题
log4j.appender.MAIL.Subject=ErrorMessage
#发送邮件箱的用户
log4j.appender.MAIL.SMTPUsername=yin_jw123@126.com
#发送邮件箱的密码
log4j.appender.MAIL.SMTPPassword=yinjianwei
#发送邮件箱
log4j.appender.MAIL.From=yin_jw123@126.com
#接受邮件箱
log4j.appender.MAIL.To=yin_jw456@126.com
log4j.appender.MAIL.layout=org.apache.log4j.PatternLayout
#com.study.logMail包下面的ERROR级别以上的log都是采用邮件发送
log4j.logger.com.study.logMail = ERROR,MAIL

public class Log4jSendMail {
public static void main(String args[]) throws InterruptedException {
PropertyConfigurator.configure(Log4jSendMail.class.getResource("/log4j.properties"));
Logger logger = Logger.getLogger(Log4jSendMail.class);
while (true) {
Thread.sleep(5000);
logger.error("Do you received message?");
}

}

}
为什么？？？ 在线等 加急！

自己发现问题：
log4j.rootLogger=info,console,MAIL
忘记加 MAIL 了

博主 么么哒 你的两个方法都成功了