show backend error on Flex side

higuys

I have a application which submits an email.

this is the flex code
public function sendEmail(event:CloseEvent):void{
workflocomponent.sendEmail(); // this makes a remote java call

My requirment is the following

if(email has been sent sucessfully) {
statusSent.text = "Email has been sent";
}
else if (email has not been sent){
statusError.text = "some error. Contact System Admin."
}
}

<mx:Label id = 'statusSent' fontWeight = 'bold' color = 'green'/>
<mx:Label id = 'statusError' fontWeight = 'bold' color = 'red'/>

This is my simple java method sendEmail()  which is invoked by the above flex code

public void sendEmail() throws Exception{
Properties props = new Properties();
props.put("mail.smtp.host", host);
try {
Transport.send(simpleMessage);            
} catch (MessagingException e)
 {                  
logger.error("Excpetion thrown in SendEmail.send():"+e.getMessage());
}
}

 I am able to see the error message  e.getMessage() in the catch block in java:
catch (MessagingException e) {                  
logger.error("Excpetion thrown in SendEmail.send():"+e.getMessage());
}

I just want to pass the e.getMessage() to flex side. Any ideas?

thanks