Outlook prompts for IMAP user/PW when domain PW changes

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Mark Foley

Senior Member
Outlook version
Outlook 2010 64 bit
Email Account
We are using Outlook 2010 and 2013 in our office in an Active Directory environment. We use Dovecot/IMAP as the mail server on the Active Directory/Domain Controller. The Domain username and IMAP email username are the same, but the IMAP server does not use AD credentials -- there is a password different from the AD password configured in Outlook.

Our AD passwords are required to change every 90 days. When I change my AD domain password, then open Outlook, I am prompted for the Outlook password. This a bit confusing because Outlook does not want the AD password just changed to, but the previously configured Outlook/IMAP password.

I have extensively tested to see what the Dovecot IMAP server is receiving by way of credentials from Outlook. Normally, it receives the username and password as configured in Outlook. But when the AD password changes, it sends a blank password to Dovecot and will not send the configured password until it is re-entered in the Outlook dialog. Apparently, Outlook determines that the domain username is the same as the Outlook username and either blanks out the configured password, or sends a blank password to the server until the password is re-entered. If the Outlook username is not also a domain user, it does not do the pw blanking thing.

I have also tested with another IMAP client (eMclient) on the same Windows machine with the same username and email password and it DOES NOT send a blank password to Dovecot.

I've tried the registry setting idea described here https://support.microsoft.com/en-us/kb/940171,but it didn't work.

How can I prevent Outlook from auto-expiring the email account password when the domain password changes?
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