1) Under the Edit menu, choose Preferences.
2) Select Mail and Newsgroups in the Categories section of the window.
3) Click on Mail Servers
4) In the field, "Outgoing mail server user name" type your username
5) Next time you send an email, it may prompt you for your password; enter it and check ‘save password’

Netscape 6.x

1) Under the Edit menu, choose Mail & Newsgroup Account Settings.
2) Select Edit > Mail & Newsgroup Account Settings
3) Select the Outgoing Server (SMTP) from the bottom of the left side window
4) Check the box next to Use name and password
5) Enter your username
6) Click OK
7) Next time you send an email, it will prompt you for your password; enter it and check ‘save password’

Outlook Express and Outlook 97/2000

1) Under the Tools menu, choose Accounts.
2) Select your mail account and click on the Properties button.
3) Select the SERVERS tab
4) Make sure the Incoming and Outgoing mail servers are set to your domain name
5) Check the option for 'Outgoing mail server' - 'My server requires authentication'.
6) In Settings > 'Use same settings as my incoming mail server'
7) Click OK and Close the mail accounts properties window.

Outlook XP

1) Under the Tools menu, choose Email Accounts and click Next .
2) Select your mail account and click on the Change… button.
3) Make sure the Incoming and Outgoing mail servers are set to your domain name
4) Check the button More Settings > Outgoing Server tab
5) Check 'My outgoing server (SMTP) requires authentication'.
6) Select ‘Use same settings as my incoming mail server’
7) Click OK > Next > Finished.