System.web.mail gmail error: System.Web.HttpException: The transport failed to connect to the server

Hello there,

Im using VWD2008 and sql server express for the development of my school project..I have an application which could send newsletter to subscribed user, but i get this error upon sending the mail:

A general exception occurred! System.Web.HttpException: The transport failed to connect to the server. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80040213): The transport failed to connect to the server. --- End of inner exception stack trace --- at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at System.Web.Mail.SmtpMa ...