Sorry, figured it out:
Outlook Express - PC
Versions 4.x and later
Select Tools on the Outlook Express menu and open the Accounts item
Click the Mail tab to show all your email accounts
Highlight the SFF Net email account, and click the Properties button to show the settings
Click the Servers tab, which shows you all the mail server settings
In the Outgoing Mail Server section, make sure the My server requires authentication checkbox is checked
Click the Settings... button next to it and be sure the Use the same settings as my incoming mail server option is selected.
Outlook Express - PC
Versions 4.x and later
Select Tools on the Outlook Express menu and open the Accounts item
Click the Mail tab to show all your email accounts
Highlight the SFF Net email account, and click the Properties button to show the settings
Click the Servers tab, which shows you all the mail server settings
In the Outgoing Mail Server section, make sure the My server requires authentication checkbox is checked
Click the Settings... button next to it and be sure the Use the same settings as my incoming mail server option is selected.
