Problem with IMAP configuration in New Outlook for Windows

Question

I am experiencing an issue with a third-party IMAP account in the New Outlook for Windows.

The correct incoming IMAP server for my account is:

mail-di.inf.puc-rio.br

When adding the account, I disable automatic server discovery and manually enter mail-di.inf.puc-rio.br as the IMAP server.

However, after saving the account, New Outlook automatically replaces the server with:

mail.inf.puc-rio.br

This server is incorrect and does not work for my account.

I have already removed the account using "Remove from all devices" and added it again from scratch, with automatic discovery disabled. The problem persists.

After the account is created, the incoming IMAP server field is read-only, so I cannot correct it manually.

It appears that New Outlook may have an incorrect server-side IMAP configuration cached or associated with this email account.

Could you please investigate the server-side configuration associated with this account and reset/correct the stored IMAP server information so that New Outlook retains the manually specified server mail-di.inf.puc-rio.br?

Please escalate this case if a server-side reset is required.

Answer 1

@Marcos Kalinowski said

after saving the account, New Outlook automatically replaces the server ...

I've seen three possible causes for this:

1 -- Locally cached server settings.

In addition to removing the account from all devices, try also Nuking your New Outlook for Windows Profile.

• View -> View settings -> Accounts > Your accounts
• Pick an Account and [Manage]
• [Remove]
• (o) Remove from all devices (If you see it)

Then to Nuke the profile see the answer by "Hornblower409 Dec 11, 2025" in
https://learn.microsoft.com/en-us/answers/questions/5655980/outlook-starting-error-repair-reinstall-reset-does

Deletes all local configuration files and cache. Resets the application to a first-run state. You will have to add back all of your email accounts. (Does not touch your email account data. e.g. email, contacts, calendar).

2 -- Microsoft has the wrong Auto Discovery data for your domain.

Sounds like you have already tried a full Advanced/Manual setup, but try these instructions just to be sure that you aren't using any Auto Discovery data.

See the Answer by "Hornblower409 Jun 5, 2026", "New Outlook for Windows - Force Advanced/Manual Setup" at
https://learn.microsoft.com/en-us/answers/questions/5912443/i-changed-hosting-provider-and-associated-dns-new

3 -- Microsoft Cloud is stuck on your old hosting service.

There have been a few reports that when an existing email account is moved to a new hosting service, Microsoft Cloud seems to "remember" the old hosting service server settings.

https://techcommunity.microsoft.com/discussions/OutlookGeneral/new-outlook-changing-the-imapremoteserverinfo-is-not-allowed-after-host-migratio/4533161

Test - Create a new email account on the new hosting service and add it to Outlook. If that works, but an email that was used on the old hosting service still fails, you've got the bug,

Not something you can fix from the client. You'll have to bring in Microsoft Support.

Answer 2

Hi @Marcos Kalinowski

I understand how frustrating this is, especially after you removed the account from all devices and configured it again from scratch.

You have already completed Microsoft’s recommended reset for IMAP/POP connection information by selecting Remove from all devices and then re-adding the account. However, New Outlook still replaces the correct incoming IMAP server, mail-di.inf.puc-rio.br, with mail.inf.puc-rio.br after the account is saved, and the server field then becomes read-only.

Since the same behavior continues after the reset, this requires further investigation through New Outlook support rather than repeating the account setup steps.

• Go to Contact Microsoft Support.
• Select Show expanded list of products.
• Select Outlook > Get Home support.
• Enter Outlook live chat, then select Get Help > Contact Support.
• Sign in with the affected account. If that is not possible, use another Microsoft account to view the available support options.
• Ask our Support Assistant > Type "Talk to live chat agent" > Contact Support
• Under Products & Services, select Other Products > Outlook, then choose Chat with a support agent in your web browser.

Please note that this is a user-to-user support forum. Moderators, contributors including external Microsoft employees cannot directly intervene in Microsoft product features or access back-end systems. Our role is limited to providing technical guidance on reported issues, requests, or ideas only.

In the meantime, you may continue using Classic Outlook or another IMAP client that retains the correct server settings.

Thank you for your understanding.

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