No inbox detected with Proton mail

[AKRigley]

I get the following message from eM Client when connecting to Proton Bridge: “[IMAP] Cannot open folder “/Inbox”. (NO no such mailbox)”

Both IMAP and SMTP validate in eM Client diagnostics

I am able to send mail but not receive mail

I suspect the problem may be that during the initial setup when asked if I trusted the certificate for 127.0.0.1:1143 I checked “don’t ask again” and inadvertently clicked “Don’t Connect”.

I have deleted and recreated the account but the certificate check question is not asked again.

Any pointers would be appreciated, Thanks

Connection log follows:
16:55:39.965|001| eM Client 9.2.2093+6d2fe6bf90 (Windows)
16:55:39.969|01C| Account’s UID is 626a5f96-0932-4f04-aea1-5565a9448b67
16:55:39.970|01C| AccountBase.ChangeOnlineState : State changed to ONLINE due User
16:55:39.972|01C| >>> ListFoldersAsync(): Start
16:55:39.974|01C| 01: Connecting to 127.0.0.1:1143…
16:55:39.975|01C| >>> FolderActivated(folder: /Inbox [Inbox]):
16:55:39.976|01C| Folder /Inbox [Inbox] is now watched
16:55:39.977|01C| >>> FolderActivated(folder: /Inbox [Inbox]):
16:55:40.003|01C| 01: * OK [CAPABILITY ID IDLE IMAP4rev1 MOVE STARTTLS UIDPLUS UNSELECT] Proton Mail Bridge 03.04.02 - gluon session ID 7
16:55:40.003|01C| 01: A1 STARTTLS
16:55:40.004|01C| 01: A1 OK Begin TLS negotiation now
16:55:40.004|01C| 01: Starting TLS stream to 127.0.0.1 …
16:55:40.021|01C| >>> Starting account synchronization
16:55:40.029|01C| 01: TLS stream established with Protocol: Tls12, NegotiatedCipherSuite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, CipherAlgorithm: Aes128, HashAlgorithm: Sha256
16:55:40.030|01C| 01: A2 CAPABILITY
16:55:40.034|01C| 01: * CAPABILITY ID IDLE IMAP4rev1 STARTTLS
16:55:40.034|01C| 01: A2 OK CAPABILITY
16:55:40.036|01C| 01: A3 LOGIN “[email protected]”
16:55:40.339|01C| 01: A3 OK [CAPABILITY ID IDLE IMAP4rev1 MOVE STARTTLS UIDPLUS UNSELECT] Logged in
16:55:40.339|01C| 01: A4 ID (“name” “eM Client” “version” “9.2.2093.0” “GUID” “EMCLIENT_V1” “vendor” “eM Client” “contact” “[email protected]”)
16:55:40.341|01C| 01: * ID (“name” “Proton Mail Bridge” “version” “03.04.02” “os” “windows” “vendor” “TODO” “support-url” “TODO”)
16:55:40.342|01C| 01: A4 OK ID
16:55:40.342|01C| 01: Detected server type: ProtonMail
16:55:40.342|01C| 01: A5 LIST “” ""
16:55:40.359|01C| 01: * LIST (\Noselect \Unmarked) “/” “Folders”
16:55:40.360|01C| 01: * LIST (\Unmarked) “/” “Folders/Property”
16:55:40.360|01C| 01: * LIST (\Noselect \Unmarked) “/” “Labels”
16:55:40.361|01C| 01: * LIST (\Junk \Noinferiors \Unmarked) “/” “Spam”
16:55:40.361|01C| 01: * LIST (\Drafts \Noinferiors \Unmarked) “/” “Drafts”
16:55:40.362|01C| 01: * LIST (\Archive \Noinferiors \Unmarked) “/” “Archive”
16:55:40.362|01C| 01: * LIST (\Noinferiors \Sent \Unmarked) “/” “Sent”
16:55:40.363|01C| 01: * LIST (\All \Marked \Noinferiors) “/” “All Mail”
16:55:40.363|01C| 01: * LIST (\Noinferiors \Trash \Unmarked) “/” “Trash”
16:55:40.363|01C| 01: * LIST (\Marked \Noinferiors) “/” “Inbox”
16:55:40.364|01C| 01: * LIST (\Flagged \Noinferiors \Unmarked) “/” “Starred”
16:55:40.364|01C| 01: A5 OK LIST
16:55:40.365|01C| 01: A6 STATUS “All Mail” (UNSEEN)
16:55:40.365|01C| 01: A7 STATUS “Archive” (UNSEEN)
16:55:40.365|01C| 01: A8 STATUS “Drafts” (UNSEEN)
16:55:40.366|01C| 01: A9 STATUS “Folders/Property” (UNSEEN)
16:55:40.366|01C| 01: A10 STATUS “Inbox” (UNSEEN)
16:55:40.366|01C| 01: A11 STATUS “Sent” (UNSEEN)
16:55:40.367|01C| 01: A12 STATUS “Spam” (UNSEEN)
16:55:40.367|01C| 01: A13 STATUS “Trash” (UNSEEN)
16:55:40.370|01C| 01: * STATUS “All Mail” (UNSEEN 8)
16:55:40.370|01C| 01: A6 OK STATUS
16:55:40.373|01C| 01: * STATUS “Archive” (UNSEEN 0)
16:55:40.374|01C| 01: A7 OK STATUS
16:55:40.376|01C| 01: * STATUS “Drafts” (UNSEEN 0)
16:55:40.377|01C| 01: A8 OK STATUS
16:55:40.380|01C| 01: * STATUS “Folders/Property” (UNSEEN 0)
16:55:40.381|01C| 01: A9 OK STATUS
16:55:40.381|01C| 01: A10 NO no such mailbox
16:55:40.385|01C| 01: * STATUS “Sent” (UNSEEN 7)
16:55:40.385|01C| 01: A11 OK STATUS
16:55:40.388|01C| 01: * STATUS “Spam” (UNSEEN 0)
16:55:40.388|01C| 01: A12 OK STATUS
16:55:40.390|01C| 01: * STATUS “Trash” (UNSEEN 0)
16:55:40.391|01C| 01: A13 OK STATUS
16:55:40.391|01C| >>> ListFoldersAsync(): End: 10 folders found
16:55:40.391|01C| >>> Connection 1 is now spare
16:55:40.392|01C| >>> Account folders synchronized
16:55:40.392|01C| 01: A14 SELECT “INBOX”
16:55:40.392|01C| >>> Forced sync of folder /All Mail marked for offline-use
16:55:40.393|01C| >>> FolderActivated(folder: /Sent [Sent]):
16:55:40.396|01C| 01: A14 NO no such mailbox
16:55:40.396|01C| 01: Failed to open folder /Inbox [Inbox]
16:55:40.397|01C| >>> Forced sync of folder /Archive [Archive] marked for offline-use
16:55:40.400|01C| >>> Forced sync of folder /Drafts [Draft] marked for offline-use
16:55:40.402|01C| >>> Forced sync of folder /Junk E-mail [Spam] marked for offline-use
16:55:40.402|01C| >>> COMMAND EXCEPTION: MailClient.Protocols.Imap.FolderOpenException: Cannot open folder “/Inbox”. (NO no such mailbox)
16:55:40.403|01C| at MailClient.Protocols.Imap.ConnectionPoolEntry.SelectFolderAsync(Folder folder)
16:55:40.403|01C| at MailClient.Protocols.Imap.ConnectionPool.AcquireConnectionAsync(Folder mailFolder, Boolean noSelect)
16:55:40.403|01C| at MailClient.Protocols.Imap.ConnectionContext.CreateContextAsync(ImapAccount account, Folder folder, Boolean noSelect)
16:55:40.403|01C| at MailClient.Protocols.Imap.ImapMailSynchronizer.SynchronizeMessagesAsync(IItemSynchronizeContext1 synchronizeContext, Folder folder, Boolean fast, CancellationToken cancellationToken) 16:55:40.404|01C| at MailClient.Protocols.Imap.ImapMailSynchronizer.Synchronize(IItemSynchronizeContext1 synchronizeContext, Folder folder, CancellationToken cancellationToken)
16:55:40.404|01C| at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass40_2.<EnqueueSynchronize>b__6(WorkerStatus status, CancellationToken ct) 16:55:40.404|01C| at MailClient.Protocols.Imap.ImapActionCommand.<>c__DisplayClass11_0.<.ctor>b__0(WorkerStatus ws, CancellationToken ct) 16:55:40.405|01C| at MailClient.Protocols.Imap.ImapActionCommand.ExecuteInternalSync(WorkerStatus status) 16:55:40.405|01C| at MailClient.Protocols.Imap.ImapActionCommand.Execute(WorkerStatus status) 16:55:40.405|01C| COMMAND STACK TRACE: 16:55:40.406|01C| at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass40_1.g__RunSynchronize|2()
16:55:40.406|01C| at MailClient.Protocols.Common.ItemSynchronizer2.<>c__DisplayClass40_0.<EnqueueSynchronize>b__0() 16:55:40.406|01C| at MailClient.Protocols.Common.AccountBase.RunIfOnline(Action actionIfOnline, Action actionIfOffline) 16:55:40.407|01C| at MailClient.Protocols.Common.ItemSynchronizer2.EnqueueSynchronize(Folder folder, Boolean fast, CancellationToken cancellationToken, Action1 completed) 16:55:40.407|01C| at MailClient.Protocols.Common.ItemSynchronizer2.Synchronize(Folder folder, SynchronizationPriority priority, Action1 completed) 16:55:40.407|01C| at MailClient.Storage.Application.ItemCollection2.Synchronize(SynchronizationPriority priority, Action1 completed, Boolean fromUI) 16:55:40.408|01C| at MailClient.Storage.Application.Folder.Synchronize(SynchronizationPriority priority, Boolean fromUI) 16:55:40.408|01C| at MailClient.Storage.Application.Folder.Synchronize(Boolean forced, Boolean fromUI) 16:55:40.408|01C| at MailClient.Protocols.Common.FolderSynchronizer.FolderActivated(Folder folder, Boolean goingOnline) 16:55:40.409|01C| at MailClient.Protocols.Imap.ImapFolderSynchronizer.FolderActivated(Folder folder, Boolean goingOnline) 16:55:40.409|01C| at MailClient.Protocols.Common.FolderSynchronizer.GoOnlinePost() 16:55:40.410|01C| at MailClient.Protocols.Imap.ImapFolderSynchronizer.GoOnlinePost() 16:55:40.410|01C| at MailClient.Protocols.Imap.ImapAccount.GoOnlineInt() 16:55:40.410|01C| at MailClient.Protocols.Common.AccountBase.ChangeOnlineState(Boolean online, OfflineReason offlineReason) 16:55:40.411|01C| at MailClient.Protocols.Common.AccountBase.GoOnline() 16:55:40.411|01C| at MailClient.Protocols.Common.AccountBase.RunIfOnline[T](Func1 actionIfOnline, Func`1 actionIfOffline)
16:55:40.411|01C| at MailClient.Protocols.Common.SynchronizableMailAccount.Synchronize(SynchronizationPriority priority)
16:55:40.412|01C| at MailClient.Accounts.BindingAccountBase.Receive()
16:55:40.412|01C| at MailClient.Accounts.AccountManager.ReceiveAllInternal(Boolean checkIncludeInGlobalOperations)
16:55:40.413|01C| at MailClient.Accounts.AccountManager.SendAndReceiveAll(Boolean checkIncludeInGlobalOperations)
16:55:40.413|01C| at MailClient.Accounts.DesktopAccountManager.timerSendAndReceive_Tick(Object sender, EventArgs e)
16:55:40.414|01C| at System.Windows.Forms.Timer.OnTick(EventArgs e)
16:55:40.414|01C| at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m)
16:55:40.414|01C| at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, WM msg, IntPtr wparam, IntPtr lparam)
16:55:40.415|01C| at Interop.User32.DispatchMessageW(MSG& msg)
16:55:40.415|01C| at System.Windows.Forms.Application.ComponentManager.Interop.Mso.IMsoComponentManager.FPushMessageLoop(UIntPtr dwComponentID, msoloop uReason, Void pvLoopData)
16:55:40.415|01C| at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(msoloop reason, ApplicationContext context)
16:55:40.416|01C| at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(msoloop reason, ApplicationContext context)
16:55:40.416|01C| at System.Windows.Forms.Application.Run(ApplicationContext context)
16:55:40.416|01C| at MailClient.Program.<>c.b__185_3()
16:55:40.417|01C| at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme)
16:55:40.417|01C| at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj)
16:55:40.417|01C| at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
16:55:40.418|01C| at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
16:55:40.418|01C| at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme)
16:55:40.418|01C| at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
16:55:40.419|01C| at System.Windows.Forms.Control.WndProc(Message& m)
16:55:40.419|01C| at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
16:55:40.419|01C| at System.Windows.Forms.ContainerControl.WndProc(Message& m)
16:55:40.420|01C| at System.Windows.Forms.Form.WndProc(Message& m)
16:55:40.420|01C| at MailClient.Common.UI.Forms.BaseForm.WndProc(Message& m)
16:55:40.420|01C| at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
16:55:40.420|01C| at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
16:55:40.421|01C| at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, WM msg, IntPtr wparam, IntPtr lparam)
16:55:40.421|01C| at Xilium.CefGlue.Interop.libcef.run_message_loop()
16:55:40.421|01C| at MailClient.Program.Main(String[] args)
16:55:40.421|01C|
16:55:40.422|01C| >>> Forced sync of folder /Trash [Trash] marked for offline-use
16:55:40.422|01C| >>> Forced sync of folder /Folders/Property marked for offline-use
16:55:40.422|01C| >>> FolderDeactivated(folder: /Sent [Sent]):
16:55:40.422|01C| >>> Account synchronization finished
16:55:40.423|01C| AccountBase.ChangeOnlineState : State changed to OFFLINE due BrokenConnection
16:55:40.423|01C| >>> FolderDeactivated(folder: /Inbox [Inbox]):
16:55:40.423|01C| >>> Connection 1 is now spare
16:55:40.423|01C| >>> FolderDeactivated(folder: /Inbox [Inbox]):
16:55:40.424|01C| >>> Connection 1 is now spare
16:55:40.424|01C| >>> ConnectionPoolEntry.CloseAsync(): CloseConnectionsAsync
16:55:40.424|01C| 01: — RECEIVE CANCELLED
16:55:40.425|01C| 01: Connection 1 was closed, deliberate = True

[cyberzork]

I suspect the problem may be that during the initial setup when asked if I trusted the certificate for 127.0.0.1:1143 I checked “don’t ask again” and inadvertently clicked “Don’t Connect.

Yes agree that does sound the problem as yes you normally need to press the Install Certificate usually twice to get the Proton bridge to connect to incoming mail as per @Gary thread post below.

So as you have already tried deleting and re-adding the account and the certificate now just doesn’t appear again, I would then suggest (if this is just a brand new install of eM Client) to uninstall eM Client and then “delete the eM Client database hidden folder completely” and then start again from scratch with a new clean install.

Hidden database folder in Windows is “Users\yourusername\AppData\Roaming\eM Client”
Hidden database folder in Mac is “Users\yourusername\Library\Application Support\eM Client”

(Proton Bridge Mail Setup

Protonmail Bridge Setup

Get your mailbox details from Protonmail Bridge [image] In eM Client go to Menu > Accounts and add a new account. Choose Mail > Other. [image] Enter your email address, then on the next screen add in the IMAP server details from the Bridge. For the server use 127.0.0.1:1143 So server : Port. [image] Do the same with SMTP. The port is 1025 [image] You may get this certificate warning, just choose don’t ask again and connect. You will need to do it twice. [image] That is all there is…