SMTPAppender with CDO

[Picaso]

I tried to compile SMTPAppender using CDO. It compiles fine however it
dosen't send email!!!!!
After debugging I found out that the following condition 
//////////
        if(evaluator->isTriggeringEvent(event))
        {
                sendBuffer();
        }
//////////
in method
/////
void SMTPAppender::append(const spi::LoggingEventPtr& event)
////
never gets satisfied and hence sendBuffer method which contains the code to
send email, is never called.
I will appreciate if someone can throw some light on this.