BUG: Known or new? Outlook 2003 SP1 SPA authentication behavior: Failure then Success

H

Herb Martin

When Outlook 2003 SP1 is set to perform authentication with
a specific user name and password it seems to be sending the
credentials TWICE -- and my (Exim) email servers is accepting
the second authentication.

This Outlook behavior is confirmed by others. Reports seem to
indicate that it is sending "logged on [e.g., Domain] user's
credentials" rather than the specified username and password.

We have removed all of other authentication methods except for
the single NTLM method used for SPA so there is likely no
problem in the email server (it accept using the same code the
second time).

Is there any reason why Outlook is supposed to send other
credentials before trying the specified (in the dialog) credentials?

I am wondering if Outlook isn't sending the internal domain
credentials first, even those credentials are unrelated to this
external SMTP server authentication.

Windows 2003, Exim 4.52 against another Win2003 Server running
CygWin (current.)
 

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