I am using a one month trial version 10.4.4209 (d96494b) on Windows 11.
After starting the em client (after windows login) receiving emails from gmx account leads to a red exclamation mark next to the mail account in the e-mail tree view. The following can then can be read in the protocol:
20:21:44 [email protected] [IMAP] System.InvalidCastException: Unable to cast object of type ‘System.Int32’ to type ‘System.Int64’.
at MailClient.Protocols.Common.ItemSynchronizeContext2.StoreItems[TUid,TVid](SynchronizationType synchronizationType, IEnumerable1 newItems, Dictionary2 uniqueIdToVersionId, Dictionary2 uniqueIdToOid)
at MailClient.Protocols.Common.MailItemSynchronizeContext.StoreItems[TUid,TVid](SynchronizationType synchronizationType, IEnumerable1 newItems, Dictionary2 uniqueIdToVersionId, Dictionary2 uniqueIdToOid) at MailClient.Protocols.Common.ItemSynchronizeContext2.<>c__DisplayClass23_03.<Synchronize>g__FlushItems|1(Int32 threshold) at MailClient.Protocols.Common.ItemSynchronizeContext2.Synchronize[T,TUid,TVid](SynchronizationType synchronizationType, IEnumerable1 items, Func2 getUniqueId, Func2 getVersionId, Func3 hasChanged, Func2 isDeleted, Func2 convertItems, Action2 updateItem) at MailClient.Protocols.Imap.SyncOperations.BaseSyncOperation.WriteSyncItemsToDb(CancellationToken& cancellationToken) at MailClient.Protocols.Imap.SyncOperations.BaseSyncOperation.ProcessFetchNotifications(CancellationToken& cancellationToken, Boolean fromInterruption) at MailClient.Protocols.Imap.SyncOperations.BaseSyncOperation.ProcessPriorityUpdatesAsync(CancellationToken& cancellationToken) at MailClient.Protocols.Imap.SyncOperations.BaseSyncOperation.<>c__DisplayClass80_0.<<FetchRawMessagesAsync>g__FetchRawMessagesSlowAsync|0>d.MoveNext() --- End of stack trace from previous location --- at MailClient.Protocols.Imap.SyncOperations.BaseSyncOperation.FetchNewMessagesAsync(SequenceSet uidSet, UInt32 messageCountEstimate, Boolean narrowed, Boolean chunk, Boolean allowLegacyHybridMode, Boolean allowHybridRawSearch, CancellationToken cancellationToken) at MailClient.Protocols.Imap.SyncOperations.NormalSyncOperation.SynchronizeEmptyLocalFolder(UInt32 serverMessageCount, UInt32 uidNext, CancellationToken cancellationToken) at MailClient.Protocols.Imap.SyncOperations.NormalSyncOperation.ExecuteInternalAsync(CancellationToken cancellationToken) at MailClient.Protocols.Imap.SyncOperations.BaseSyncOperation.ExecuteAsync(CancellationToken cancellationToken) at MailClient.Protocols.Imap.ImapMailSynchronizer.SynchronizeMessagesAsync(IItemSynchronizeContext1 synchronizeContext, Folder folder, Boolean fast, CancellationToken cancellationToken)
at MailClient.Protocols.Imap.ImapMailSynchronizer.SynchronizeMessagesAsync(IItemSynchronizeContext1 synchronizeContext, Folder folder, Boolean fast, CancellationToken cancellationToken) at MailClient.Protocols.Imap.ImapMailSynchronizer.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)
at MailClient.Protocols.Common.ItemSynchronizer`2.<>c__DisplayClass37_2.b__6(WorkerStatus status, CancellationToken ct)
at MailClient.Protocols.Imap.ImapActionCommand.<>c__DisplayClass11_0.<.ctor>b__0(WorkerStatus ws, CancellationToken ct)
at MailClient.Protocols.Imap.ImapActionCommand.ExecuteInternalSync(WorkerStatus status)
at MailClient.Protocols.Imap.ImapActionCommand.Execute(WorkerStatus status)
at MailClient.Commands.Command.Process(WorkerStatus status)
— End of stack trace from previous location —
at MailClient.Protocols.Imap.ImapAccount.SynchronizeIntAsync(Boolean forced)
at MailClient.Protocols.Common.SynchronizableMailAccount.<>c__DisplayClass22_0.<b__0>d.MoveNext()
IMAP_SERVER_TYPE = Gmx
RunInPlace = False
GUIStatus_Exception_Reported = True
Trying a manual synchronisation several times is not successful.
After some time (several minutes) the red exclamation mark disappears. Then in the protocol there is reported success accordingly .