Remote Approval log files \wfgen\App_Data\LogFiles\RemoteApproval
Complete error message:
WebException Error: Check Exchange server address and security type.
The request failed with HTTP status 401: Unauthorized.; at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at EmailListener.EWS.ExchangeServiceBinding.FindItem(FindItemType FindItem1)
at EmailListener.Exchange2007\_2010.StartProcess(); System.Web.Services;
Solution
The Basic Authentication for the Active Directory account associated to the email address must have permissions to open a session locally on the Exchange Server and the web server.