问如何通过电子邮件发送log4j日志文件

EN

    import org.apache.log4j.Logger;   
import org.apache.log4j.PatternLayout;  
import org.apache.log4j.net.SMTPAppender;  

public class LogSender {  
    static Logger logger = Logger.getLogger(test.class);  
    SMTPAppender appender = new SMTPAppender();   
    public test() {  
        try {  
            appender.setTo("receiver@gmail.com");  
            appender.setFrom("sender@gmail.com");  
            appender.setSMTPHost("smtp.gmail.com");  
                    appender.setSMTPUsername("sender@gmail.com");  
                    appender.setSMTPPassword("mypassword");   
            appender.setLocationInfo(true);  
            appender.setSubject("Test Mail From Log4J");  
            appender.setLayout(new PatternLayout());  
            appender.activateOptions();  
            logger.addAppender(appender);           
            logger.error("This is an error");  
        }  
        catch(Exception e) {  
            e.printStackTrace();  
            logger.error("Thrown exception",e);  
        }  
    }   
    public static void main(String args[]) {  
        LogSender l = new LogSender;        
    }  
}   

    log4j:ERROR Error occured while sending e-mail notification.
com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. ee6sm12133321igc.6