From: chris on
Check out this link:(If you have never been there before
you have to scroll to the bottom to get the answers.
I would be asking a lot of questions that this link and
others on this link will address depending on your setup.

http://www.experts-
exchange.com/Applications/MS_Office/Outlook/Q_21099000.html

Hope this helps It should!

>-----Original Message-----
>I have a user trying to send email from his laptop today,
he was able to send
>mail yesterday, but today he cannot send messages out.
He gets the error
>0x80042109 in Outlook 2003 SP1 with the junkmail patch
installed. I
>contacted my ISP and had them look in the logs while my
user tried to
>authenticate. He does not see him getting to the server
to authenticate for
>outgoing mail. He is receiving emails fine still, but
cannot send messages.
>We had him use the test account settings function of
outlook and it fails on
>the sending pieces.
>
>We tried putting the IP address of the server in instead
of the name, and
>still errored out. The incoming and outgoing servers are
the same
>mail.xxxxx.com
>
>I have plenty of other users sending and receiving email
no problem.
>
>I had him disable the firewall on his LAN connection, I
had him turn off IBM
>Access connections.
>
>He is connected to the internet using DSL, he uses a
patch cable to connect
>his laptop to the DSL modem. He is using SBC DSL. I
don't know what to do
>next.
>.
>