title: How to implement Appender inheriting class in Log4cplus
body: <p>I want to use <strong>SMTP appender</strong> to send log messages to a given mail addres, using Log4cplus.</p>
  
  <p>Since Log4cplus does not have this appender, I know it is nesessary to extend/inherit the Appender class and implement my own SMTP appender. </p>
  
  <p>Since I haven't seen any example for inheriting and implementing an appender, I would like to ask:
  Can anyone share a code example or a reference of inheriting and implementing an appender class?</p>
  
  <p>I will be greatfull for any help.</p>