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The e-mail server you are using requires SMTP Authentication Enabled

For step by step instructions for

For Netscape:
There are no additional settings to enable SMTP Authentication in Netscape Messenger

If you are using a Mac:
For SMTP Authentication, make sure that your Mac users have Outlook Express 5.02, then...

Open the configured account that is having issues... Go to the servers tab.

At the bottom of the box you will see a 'click here for advance sending options' button. Click this button.

When the dialog box opens, click the 'SMTP server requires authentication' check box. By default, the 'Use same settings as incoming mail server' button is clicked.

Check 'Log on using' instead of 'Use same settings as incoming mail server.' In the account ID box, enter your Account as you email address, but instead of the '@' sign, use the '&' sign.

For Eudora:

We recomend upgrading upgrade to the latest verison of Eudora which is 5.x

1.. Open Eudora.
The Options window will display. If not, click Tools on the menu bar then Options.

2.. Scroll to the top of the list and Select Getting Started.

3.. Complete the fields:

a.. Real Name - The name from which any e-mail sent using this profile will display.

b.. Return Address - The address from which any e-mail sent will display. This is the address from which you may drop the mail from your domain name. For example: bob@not-any.com

c.. Mail Server (Incoming) - The mail server your incoming e-mail will go through.

d.. Login Name - Your user name (i.e., if your user name is bob@yourdomain.com, then login name is "bob").

e.. SMTP Server (Outgoing) - The mail server your e-mail sent using this profile will go through. You may use your ISP's outgoing mail server, or your IMail server, which will be mail.YourDomainName.com.

f.. Allow Authentication - you would want to check this box if you want to be prompted for a password when you check your mail.

4.. Click OK.

For Outlook 97, adding the Internet mail enhancement patch for Outlook 97 allows secure password authentication. The filename is Outlimep.exe; file size is 491 KB, and it is available at:

http://officeupdate.microsoft.com/downloadCatalog/dldoutlook.htm

Enable SMTP Authentication in your email client

To enable SMTP Authentication in your email client:

In Outlook or Outlook Express:

Click tools, accounts, mail tab, then double click your mail account. Click the servers tab, then under "Outgoing mail server, check "my server requires authentication".

In Outlook XP,

Click tools, email accounts, view or change existing email accounts, double click the account, more settings, outgoing server tab, then check the box for "my server requires authentication".

In Netscape:

There are no additional settings to enable SMTP Authentication in Netscape Messenger

In Eudora,

This is checked by default, but just in case, click tools, options, then check "Allow authentication