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Temporary authentication failure

Claus C. shared this problem 6 months ago
Published

My IMAP client is getting these errors this morning, is there a general problem?

09.25.56.361|008| 01: A2 LOGIN "mail@CUSTOM_DOMAIN" <Parameter removed for privacy reasons.>

09.26.02.379|008| 01: A2 NO [UNAVAILABLE] Temporary authentication failure. [director-03:2025-07-24 07:26:02]

Replies (4)

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The problem was apparently on my side 😳

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May I know how you fixed the issue? I am facing similar issue while trying to add email to Thunderbird on Android.

Thank you!

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So I am using two-factor authentication (2FA), if you are not, then this might not be the solution for you.

Here is how I got it to work (again):

1. Go to "All settings..." on app.mailbox.org:

9b32ac28b7d99ae3d40c8c11b04cd5bc

2. Click on "Security", expand "Email app-passwords" (important - not "App passwords"), delete the existing one (this might not have been necessary), enter a new password name (here it would make sense to type "Thunderbird" in your case), check both boxes (IMAP/SMTP) and finally click "Add new password":

aaadf48655f7e8e9c9a63a29c7922ff0

3. In the email client, for the username you have to use the same as when you log in to webmail, and for the password, the newly created "email app password" (that will be shown to you after the previous step).

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Thanks a lot! I had 2fa activated and your steps helped.

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Thank you Claus. I have been searching for days and had not seen this setting. This resolved my problem. Tschüss!

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I am having a similar problem. I tried to login using my phone browser to generate the email app password but the menu for "Email app password" is not in my settings

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2

I spent a ridiculous amount of time looking for the setting for application passwords, until I finally found it: Settings -> mailbox.org -> My account -> Email app-passwords. I do not understand why it isn't under "Application Passwords" in the settings menu.

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imap password still an issue. anyone got a mail provider that can manage basic security.

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Hi Stacy,

I'm sorry to hear that you are having issues with the IMAP Password. Could you please describe exactly what the issue is, so I can look into the matter? Please let me know what client you are using, how you are authenticating and what the error-message is you are receiving.

Thank you in advance.

With kind regards


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Felix Kaspar
Teamlead
mailbox Support

Useful Links:

d9e15a7fee470fb66af17115c3a43886

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Same issue here using emClient. Constant 'Temporary authentication failure' warnings when using 2FA but emClient configured to use Email App password.

logs show:

###############@mailbox.org [IMAP] MailClient.Accounts.AuthenticationAbortedException: Authentication aborted at MailClient.Protocols.Imap.ConnectionPoolEntry.<ConnectInternalAsync>g__ThrowNotOKServerResponseReacquireCredentialsFailed|58_6() at MailClient.Protocols.Imap.ConnectionPoolEntry.ConnectInternalAsync(CancellationToken cancellationToken) at MailClient.Protocols.Imap.ConnectionPoolEntry.ConnectInternalAsync(CancellationToken cancellationToken) at MailClient.Protocols.Imap.ConnectionPool.AcquireConnectionAsync(Folder mailFolder, Boolean noSelect) at MailClient.Protocols.Imap.ConnectionContext.CreateContextAsync(ImapAccount account, Folder folder, Boolean noSelect) at MailClient.Protocols.Imap.ImapMailSynchronizer.MoveAsync(Folder folder, IEnumerable`1 items, Folder targetFolder, CancellationToken cancellationToken, Boolean checkGmailInboxTags) at MailClient.Protocols.Imap.ImapMailSynchronizer.MoveAsync(IItemMoveContext`1 moveContext, Folder folder, IEnumerable`1 items, Folder targetFolder, CancellationToken cancellationToken) at MailClient.Protocols.Imap.ImapMailSynchronizer.Move(IItemMoveContext`1 moveContext, Folder folder, IEnumerable`1 items, Folder targetFolder, CancellationToken cancellationToken) at MailClient.Protocols.Common.ItemSynchronizer`2.<>c__DisplayClass33_0.<EnqueueMove>b__0(WorkerStatus status, CancellationToken cancellationToken) at MailClient.Protocols.Imap.ImapActionCommand.ExecuteInternalSync(WorkerStatus status) at MailClient.Protocols.Imap.ImapActionCommand.Execute(WorkerStatus status) at MailClient.Commands.Command.Process(WorkerStatus status) RunInPlace = False GUIStatus_Exception_Reported = True

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Hi Stephen,

thank you for your message. I will forward this issue to our administrators and get back to you as soon as I have more information. Until then I ask for a little more patience.

With kind regards


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Felix Kaspar
Teamlead
mailbox Support

Useful Links:

d9e15a7fee470fb66af17115c3a43886

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Hi Stephen,

could you please tell me the exact date and time the error occured, so we can check this in our logfiles?

Thank you in advance.

With kind regards


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Felix Kaspar
Teamlead
mailbox Support

Useful Links:

d9e15a7fee470fb66af17115c3a43886

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Error occurred at 10:14, 10:21, 10:28, 10:35, 10:41, 10:49, 10:51 GMT.

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Hi Stephen,

our administrators looked into the matter and they saw that you don't have an app password. Please set up an app password for e-mail. Here is a guide on how to proceed:

https://kb.mailbox.org/en/private/security-and-privacy/e-mail-password/

With kind regards


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Felix Kaspar
Teamlead
mailbox Support

Useful Links:

d9e15a7fee470fb66af17115c3a43886

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Hi Felix,
Thanks for looking into this. I do have an email app password for emClient, please see the screenshot below:
1578da58cc1966950210af34575349ef

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OK, this seems to be an issue with em Client.

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