Em client refuses to download all e-mails from IMAP server

On the IMAP server, there are 1460 e-mails in the Inbox. But after adding a mail account to em Client, the program loads (makes available for viewing) only 1417 e-mails. The program does not download the remaining unloaded e-mails.
It gives the error [IMAP] Unable to download message “ответ на обращение” in folder “/Inbox”.
It gives the error [IMAP] Unable to download message “Новые поступления на Яндекс.Музыке” in folder “/Inbox”.
At the same time Thunderbird downloads all emails from the Inbox folder via IMAP. And it downloads this emails that em client cannot download.

Account settings:
Message sync time period: All time
Download messages for offline use and to search in message bodies :white_check_mark:
Include attachments to search in attached documents :white_check_mark:
Em client: 9.2.2157 (5b49542)

Error log #1
13:11:22.180|057| >>> Account synchronization finished
13:11:22.181|057| 01: — CMD UID FETCH: CONNECTION IS IDLING
13:11:22.181|057| 01: DONE
13:11:22.218|057| 01: A33 OK IDLE Terminated
13:11:22.218|057| 01: — CMD UID FETCH: IDLING TERMINATED
13:11:22.218|057| 01: A34 UID FETCH 2440 (BODY.PEEK[1.2.MIME] BODY.PEEK[1.2] BODY.PEEK[2.MIME] BODY.PEEK[2])
13:11:22.440|057| 01: * 266 FETCH (UID 2440 BODY[1.2.MIME] {47}
13:11:22.440|057| 01: BODY[1.2] BODY[2.MIME] {198}
13:11:22.440|057| 01: BODY[2] {1516764}
13:11:22.662|057| 01: )
13:11:22.662|057| 01: A34 OK UID FETCH Completed.
13:11:22.673|057| >>> COMMAND EXCEPTION: MailClient.Protocols.Imap.ImapException: Unable to download message “ответ на обращение” in folder “/Inbox”.
13:11:22.673|057| at MailClient.Protocols.Imap.ImapMailSynchronizer.PrefetchItemsAsync(IPrefetchProgress progress, Folder folder, IEnumerable1 items, PrefetchType prefetchType, CancellationToken cancellationToken) 13:11:22.673|057| at MailClient.Protocols.Imap.ImapMailSynchronizer.PrefetchItemsAsync(IPrefetchProgress progress, Folder folder, IEnumerable1 items, PrefetchType prefetchType, CancellationToken cancellationToken)
13:11:22.673|057| at MailClient.Protocols.Imap.ImapMailSynchronizer.PrefetchItems(IPrefetchProgress progress, Folder folder, IEnumerable1 items, PrefetchType prefetchType, CancellationToken cancellationToken) 13:11:22.673|057| at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass43_0.b__2(WorkerStatus status, CancellationToken cancellationToken1)
13:11:22.673|057| at MailClient.Protocols.Imap.ImapActionCommand.<>c__DisplayClass11_0.<.ctor>b__0(WorkerStatus ws, CancellationToken ct)
13:11:22.673|057| at MailClient.Protocols.Imap.ImapActionCommand.ExecuteInternalSync(WorkerStatus status)
13:11:22.673|057| at MailClient.Protocols.Imap.ImapActionCommand.Execute(WorkerStatus status)
13:11:22.673|057| COMMAND STACK TRACE:
13:11:22.673|057| at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass43_0.<EnqueuePrefetch>b__0() 13:11:22.673|057| at MailClient.Protocols.Common.AccountBase.RunIfOnline(Action actionIfOnline, Action actionIfOffline) 13:11:22.673|057| at MailClient.Protocols.Common.ItemSynchronizer2.EnqueuePrefetch(Folder folder, IEnumerable1 items, Int32 countEstimate, Int32 initialProgress, PrefetchType prefetchType, SynchronizationPriority priority, CancellationToken cancellationToken, Action1 completed)
13:11:22.673|057| at MailClient.Protocols.Common.ItemSynchronizer`2.<>c__DisplayClass40_2.b__6(WorkerStatus status, CancellationToken ct)
13:11:22.673|057| at MailClient.Protocols.Imap.ImapActionCommand.<>c__DisplayClass11_0.<.ctor>b__0(WorkerStatus ws, CancellationToken ct)
13:11:22.673|057| at MailClient.Protocols.Imap.ImapActionCommand.ExecuteInternalSync(WorkerStatus status)
13:11:22.674|057| at MailClient.Protocols.Imap.ImapActionCommand.Execute(WorkerStatus status)
13:11:22.674|057| at MailClient.Commands.Command.Process(WorkerStatus status)
13:11:22.674|057| at MailClient.Commands.DefaultSynchronizationQueue.ThreadWorker(Object threadData)
13:11:22.674|057| at System.Threading.Thread.StartHelper.Callback(Object state)
13:11:22.674|057| at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
13:11:22.674|057| at System.Threading.Thread.StartCallback()
13:11:22.674|057|
13:11:22.674|057| AccountBase.ChangeOnlineState : State changed to OFFLINE due BrokenConnection
13:11:22.674|057| >>> FolderDeactivated(folder: /Inbox [Inbox]):
13:11:22.674|057| >>> ConnectionPoolEntry.CloseAsync(): Deactivate(connection.ActiveFolder: /Inbox [Inbox])
13:11:22.674|057| 01: — RECEIVE CANCELLED
13:11:22.675|057| >>> ConnectionPoolEntry.CloseAsync(): CloseConnectionsAsync
13:11:22.675|057| 01: Connection 1 was closed, deliberate = True
13:11:22.675|057| 02: — RECEIVE CANCELLED

Error log #2
13:26:29.844|01C| 01: A34 OK UID FETCH Completed.
13:26:29.847|01C| 01: A35 UID FETCH 407 (BODY.PEEK[HEADER] BODY.PEEK[1.MIME] BODY.PEEK[1.1.MIME] BODY.PEEK[1.1.1.MIME] BODY.PEEK[1.1.1] BODY.PEEK[1.1.2.MIME] BODY.PEEK[1.1.2])
13:26:30.101|01C| 01: * 45 FETCH (UID 407 BODY[HEADER] {1721}
13:26:30.101|01C| 01: BODY[1.MIME] {91}
13:26:30.101|01C| 01: BODY[1.1.MIME] {95}
13:26:30.101|01C| 01: BODY[1.1.1.MIME] {76}
13:26:30.101|01C| 01: BODY[1.1.1] BODY[1.1.2.MIME] {86}
13:26:30.101|01C| 01: BODY[1.1.2] {6517}
13:26:30.101|01C| 01: )
13:26:30.137|01C| 01: A35 OK UID FETCH Completed.
13:26:30.140|01C| >>> COMMAND EXCEPTION: MailClient.Protocols.Imap.ImapException: Unable to download message “Новые поступления на Яндекс.Музыке” in folder “/Inbox”.
13:26:30.140|01C| at MailClient.Protocols.Imap.ImapMailSynchronizer.PrefetchItemsAsync(IPrefetchProgress progress, Folder folder, IEnumerable1 items, PrefetchType prefetchType, CancellationToken cancellationToken) 13:26:30.140|01C| at MailClient.Protocols.Imap.ImapMailSynchronizer.PrefetchItemsAsync(IPrefetchProgress progress, Folder folder, IEnumerable1 items, PrefetchType prefetchType, CancellationToken cancellationToken)
13:26:30.140|01C| at MailClient.Protocols.Imap.ImapMailSynchronizer.PrefetchItems(IPrefetchProgress progress, Folder folder, IEnumerable1 items, PrefetchType prefetchType, CancellationToken cancellationToken) 13:26:30.140|01C| at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass43_0.b__2(WorkerStatus status, CancellationToken cancellationToken1)
13:26:30.140|01C| at MailClient.Protocols.Imap.ImapActionCommand.<>c__DisplayClass11_0.<.ctor>b__0(WorkerStatus ws, CancellationToken ct)
13:26:30.140|01C| at MailClient.Protocols.Imap.ImapActionCommand.ExecuteInternalSync(WorkerStatus status)
13:26:30.140|01C| at MailClient.Protocols.Imap.ImapActionCommand.Execute(WorkerStatus status)
13:26:30.140|01C| COMMAND STACK TRACE:
13:26:30.140|01C| at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass43_0.<EnqueuePrefetch>b__0() 13:26:30.140|01C| at MailClient.Protocols.Common.AccountBase.RunIfOnline(Action actionIfOnline, Action actionIfOffline) 13:26:30.140|01C| at MailClient.Protocols.Common.ItemSynchronizer2.EnqueuePrefetch(Folder folder, IEnumerable1 items, Int32 countEstimate, Int32 initialProgress, PrefetchType prefetchType, SynchronizationPriority priority, CancellationToken cancellationToken, Action1 completed)
13:26:30.140|01C| at MailClient.Protocols.Common.ItemSynchronizer`2.<>c__DisplayClass40_2.b__6(WorkerStatus status, CancellationToken ct)
13:26:30.140|01C| at MailClient.Protocols.Imap.ImapActionCommand.<>c__DisplayClass11_0.<.ctor>b__0(WorkerStatus ws, CancellationToken ct)
13:26:30.140|01C| at MailClient.Protocols.Imap.ImapActionCommand.ExecuteInternalSync(WorkerStatus status)
13:26:30.140|01C| at MailClient.Protocols.Imap.ImapActionCommand.Execute(WorkerStatus status)
13:26:30.140|01C| at MailClient.Commands.Command.Process(WorkerStatus status)
13:26:30.140|01C| at MailClient.Commands.DefaultSynchronizationQueue.ThreadWorker(Object threadData)
13:26:30.140|01C| at System.Threading.Thread.StartHelper.Callback(Object state)
13:26:30.140|01C| at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
13:26:30.140|01C| at System.Threading.Thread.StartCallback()
13:26:30.140|01C|
13:26:30.140|01C| AccountBase.ChangeOnlineState : State changed to OFFLINE due BrokenConnection
13:26:30.140|01C| >>> FolderDeactivated(folder: /Inbox [Inbox]):
13:26:30.140|01C| >>> Connection 1 is now spare
13:26:30.140|01C| >>> ConnectionPoolEntry.CloseAsync(): CloseConnectionsAsync
13:26:30.140|01C| 01: — RECEIVE CANCELLED
13:26:30.141|04E| 01: Connection 1 was closed, deliberate = True

Do I understand correctly that it is pointless to expect support for this request and em client should not be considered as a reliable application for working with mail?

You do realize that this forum is “User Supported” with occasional support from eM Client personnel?

Not every user has the knowledge to respond to your issue, thus it may take longer for one of us to respond.

One suggestion I can make is since you were able to import the messages into Thunderbird would be to export those messages and import them into eMC.