4.x You can change the outgoing mail server for your secondary account in Outlook Express 4.0 through the Preferences option of the Edit menu. How to change your secondary account's outgoing mail server in Outlook Express 4.0. Open Outlook Express . From the Edit menu, choose Preferences . Click the down arrow on the Mail Accounts drop-down list and choose your secondary email account.
Additional domains Click the OK button.
You have successfully changed your secondary account's outgoing mail server in Outlook Express 4.0.