When you start Microsoft Outlook or first connect to your AT&T Internet
Mail server, you may receive the following error message:
Dial-up networking settings not valid. Please check your password.
Following this message, you may notice that sent mail does not leave your
This problem may result from either of the following:
- Incorrect settings in the Internet E-Mail service properties
- Corrupted user profile
- Corrupted user password list (.pwl)
To correctly configure the Internet E-mail service, follow these steps to
troubleshoot this problem:
- Click Start, point to Settings, and click Control Panel.
- Double-click the Mail (or Mail And Fax) icon.
- If you have more than one profile, click Show Profiles and on the
General tab, click the profile that contains your AT&T Internet
- Click Properties and on the Services tab, you should see the Internet
Mail service. If not, use the Add button to add Internet Mail.
- On the Services tab, click Internet E-Mail, and then click Properties.
On the Servers tab in the Outgoing Mail (SMTP) box, type (in lowercase)
"mailhost.worldnet.att.net" or the IP address, "220.127.116.11" (without
the quotation marks).
NOTE: AT&T also has a new SMTP address: mailhost.att.net. Make sure you
use the correct address for your mailbox.
- In the Incoming Mail (POP3) box, type (in lowercase)
"postoffice.worldnet.att.net" or the IP address, "18.104.22.168" (without
the quotation marks).
NOTE: AT&T also has a new POP3 address: postoffice.att.net. IP addresses
or literal names for mail servers may change, especially if additional
servers are added by the provider. If your mail server information is
different than listed here, use the server names provided by AT&T.
Make sure you use the correct address for your mailbox. If your mail
server information is different than listed here, use the server name
provided by AT&T.
- In the Account Name box, type the user's e-mail name up to, but not
including the @ symbol; and in Password, type your password.
- Click OK, OK, and Close to close all dialog boxes.
Start Outlook and send a message.
Creating a New Password List File
If the above steps do not resolve the error referenced in the "Symptoms"
section, your user password list may be damaged. The password list
maintains a cache of user passwords used on your computer. To create a new
password list, follow these steps:
- Click Start, point to Find, and then click Files Or Folders.
- In the Named box, type "*.pwl" (without quotation marks) and click
- Right-click the file named <username>.pwl, and click Rename on the
- Rename the file to <username>.old, and then press ENTER.
NOTE: If you are using a personal certificate, you should export it
before renaming your .pwl file. If you do not do so, it may be
unavailable when you send e-mail. For more information, see the
following article in the Microsoft Knowledge Base:
Unable to Use Personal Certificates in Outlook Express
- Restart Windows.
You will be prompted to enter a new password before entering Windows.
To obtain your personal AT&T e-mail account information, call one of these
For step-by-step instructions on configuring Outlook with AT&T World
Net, visit the AT&T World Net User's Reference Guide at the following Web
The third-party contact information included in this article is provided
to help you find the technical support you need. This contact information
is subject to change without notice. Microsoft in no way guarantees the
accuracy of this third-party contact information.
The third-party products discussed here are manufactured by vendors
independent of Microsoft; we make no warranty, implied or otherwise,
regarding these products' performance or reliability.
For more information, please see the following article in the Microsoft
: OL2000: How to Troubleshoot Mail Stuck in the Outbox
Article ID: 196081 - Last Review: October 17, 2006 - Revision: 4.0
- Microsoft Outlook 2000 Standard Edition