Outlook 2007 IMAP error 0x800CCC80

[Wayne Abruzzo]

The Outlook 2007 Beta 2 client is giving the 0x800CCC80 "None of the
authentication methods supported by this client are supported by your
server" error message when sending for an IMAP configuration running on
Windows Vista Beta 2. Is there an enhanced security setting I am missing
with the Outlook 2007 client or perhaps with Windows Vista that is
preventing messages from being sent?

ADDITIONAL INFO: Residential high speed Internet via Cox cable requires the
use of their SMTP server for all outgoing SMTP traffic so I use my incoming
IMAP server and Cox's outgoing SMTP server. I specify the appropriate
credentials for my incoming IMAP server and the appropriate credentials on
the Outgoing Server tab for the Cox SMTP server. I've Google'd the error
code and didn't get anything useful.

The identical configuration works perfectly under Windows XP / Outlook XP
(2002) and with Windows Vista / Windows Mail (default email client in
Vista). I've configured the email account slowly several times in Outlook
2007 to make sure I was not typing any of the info incorrectly. It seems to
be a security "feature" or other setting in Outlook 2007 or Windows Vista
that is preventing the connection/authentication. Or perhaps the Cox SMTP
server does not recognize commands coming from these Beta products.

Thanks for your input and suggestions.

Wayne

 

[Wayne Abruzzo]

Out of curiosity I disabled (unchecked) "My outgoing server (SMTP) requires
authentication" on the Outgoing Server tab and that resolved the problem.

It appears Cox no longer requires authentication when using their SMTP
server for outgoing email with a non-Cox email address. I've confirmed it
with Windows XP Pro SP2 / Outlook XP (2002) as well.

The only mystery now is why I get an error message when enabling
authentication and specifying my Cox credentials for outgoing email in
Outlook 2007 and no error message when doing the same with Outlook XP
(2002)??? I'm glad it works now, but I have a compulsive need to know why
and what the difference is with the new Outlook 2007 client!!!

Any additional comments or suggestions are welcome.