/// <summary>
/// Is called when message sending has completed.
/// </summary>
/// <param name="op">Asynchronous operation.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>op</b> is null reference.</exception>
private void MessageSendingCompleted(SMTP_Client.SendMessageAsyncOP op)
{
if(op == null){
throw new ArgumentNullException("op");
}
try{
if(op.Error != null){
Dispose(op.Error);
}
// Message sent sucessfully.
else{
Dispose(null);
}
}
catch(Exception x){
Dispose(x);
}
op.Dispose();
}
