I have added a default smtp-server in web.config but I get the following error anyway. Anyone know why? Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [NullReferenceException: Object reference not set to an instance of an object.] System.Xml.XmlStreamReader.Read(Byte[] data, Int32 offset, Int32 length) +26 System.Xml.XmlScanner..ctor(XmlStreamReader reader, XmlNameTable ntable, Encoding enc) +196 System.Xml.XmlTextReader..ctor(String url, Stream input, XmlNameTable nt) +102 System.Xml.XmlTextReader..ctor(Stream input) +80 EPiServer.XForms.Implementation.EMailConnection.ᐁ(XmlDocument ) +249 EPiServer.XForms.Implementation.EMailConnection.ᐁ(IItem ) +103 EPiServer.XForms.Implementation.EMailConnection.SendEmail(Object sender, ChannelEventArgs e) +65 EPiServer.BaseLibrary.Channel.ChannelEventHandler.Invoke(Object sender, ChannelEventArgs e) +0 EPiServer.Implementation.SynchronousChannel.Send(IItem item) +49 EPiServer.Implementation.DefaultRepository.Send(String channelId, IItem item) +35 EPiServer.XForms.XFormData.Send(Guid formId) +111 EPiServer.XForms.WebControls.XFormControl.SubmitForm(ChannelOptions options) +831 EPiServer.XForms.WebControls.Submit.SubmitForm(Object sender, EventArgs e) +91 System.Web.UI.Control.OnLoad(EventArgs e) +67 System.Web.UI.Control.LoadRecursive() +35 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Control.LoadRecursive() +98 System.Web.UI.Page.ProcessRequestMain() +750