Hello,
I tried this tool called "Email Appender (v1.0.2)" but its showing me following error.
![[Image: image.png]](https://i.ibb.co/m591r9CL/image.png)
All I want to do is check which mailbox are working and then use them as smtp to send bulk emails.
Are there any tools that are free that can do this?
Thanks
I tried this tool called "Email Appender (v1.0.2)" but its showing me following error.
![[Image: image.png]](https://i.ibb.co/m591r9CL/image.png)
Code
Version: 1.0.2.0
Information of System.NotSupportedException:
- Message: This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread.
- Source: PresentationFramework
- StackTrace:
at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
at EmailAppender.Models.ConcurrentObservableDictionary`2.<>c__DisplayClass9_0.<NotifyObserversOfChange>b__0(Object s)
at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
==========All I want to do is check which mailbox are working and then use them as smtp to send bulk emails.
Are there any tools that are free that can do this?
Thanks

