When you try to re-send an email that has Status Reason = Failed, this is the error.

Only updating Status Reason to Draft, you can re-send email.....

Thank you,

Alberto

Crm Exception: Message: Cannot update subject or description unless email is in draft status, ErrorCode: -2147187962
[2011-08-31 11:45:54.374] Process: w3wp |Organization:1e2c0e20-084f-e011-bf2c-005056b56657 |Thread: 51 |Category: Platform.Sdk |User: c8cb8f07-0007-4185-b15e-f5b2104b712d |Level: Error | VersionedPluginProxyStepBase.Execute
>Web Service Plug-in failed in SdkMessageProcessingStepId: {7FCDBB1B-EA3E-DB11-86A7-000A3A5473E8}; EntityName: email; Stage: 30; MessageName: Update; AssemblyName: Microsoft.Crm.Extensibility.InternalOperationPlugin, Microsoft.Crm.ObjectModel, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35; ClassName: Microsoft.Crm.Extensibility.InternalOperationPlugin; Exception: Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Web.Services.Protocols.LogicalMethodInfo.Invoke(Object target, Object[] values)
at Microsoft.Crm.Extensibility.InternalOperationPlugin.Execute(IServiceProvider serviceProvider)
at Microsoft.Crm.Extensibility.V5PluginProxyStep.ExecuteInternal(PipelineExecutionContext context)
at Microsoft.Crm.Extensibility.VersionedPluginProxyStepBase.Execute(PipelineExecutionContext context)
Inner Exception: Microsoft.Crm.CrmException: Cannot update subject or description unless email is in draft status
at Microsoft.Crm.ObjectModel.EmailService.UpdateHelper(IBusinessEntity entityInterface, ExecutionContext context, Boolean internalUpdateCall)