Has anyone else had this issue with upgrading from Build 9673 (Jun 26, 2026) to Build 9678 (Jul 1, 2026)
we upgraded by running the installer, once finished we noticed mailservice.exe quit immediately with:
Faulting application name: MailService.exe, version: 100.0.9678.26240, time stamp: 0x69e20000
Faulting module name: ntdll.dll, version: 10.0.26100.32995, time stamp: 0xb2a5d42f
Exception code: 0xc00000fd
Fault offset: 0x0000000000166f97
Faulting process id: 0x6248
Faulting application start time: 0x1DD0E229E6C11CC
Faulting application path: C:\Program Files (x86)\SmarterTools\SmarterMail\Service\MailService.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report Id: d48113a1-116d-4388-a179-54277cb2fb8f
Faulting package full name:
Faulting package-relative application ID:
I then did this:
Uninstalled Smartermail
rebooted
reinstalled smartermail (using latest 9673)
Mailservice.exe started but nothing was working and this was output to event viewer over and over:
Category: SoapCore.SoapEndpointMiddleware
EventId: 0
SpanId: c1b8499333c68ce1
TraceId: 8895cacc75af7daba96040f776becde7
ParentId: 0000000000000000
ConnectionId: 0HNMS7K8L2NU9
RequestId: 0HNMS7K8L2NU9:00000020
RequestPath: /Services/svcProductInfo.asmx
An error occurred processing the message
Exception:
System.Reflection.TargetParameterCountException: Parameter count mismatch.
at System.Reflection.MethodBaseInvoker.ThrowTargetParameterCountException()
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at SoapCore.DefaultOperationInvoker.InvokeAsync(MethodInfo methodInfo, Object serviceInstance, Object[] arguments) in /_/src/SoapCore/DefaultOperationInvoker.cs:line 16
at SoapCore.SoapEndpointMiddleware`1.ProcessMessage(Message requestMessage, SoapMessageEncoder messageEncoder, IAsyncMessageFilter[] asyncMessageFilters, HttpContext httpContext, IServiceProvider serviceProvider) in /_/src/SoapCore/SoapEndpointMiddleware.cs:line 493