Send and receive e-mails from 2 differen

I currently have one internet e-mail account setup to use Outlook 2000. After registered for another Domain Name, I wanted to setup the 2nd internet e-mail account by using the same Outlook 2000.

I can receive e-mails from the 2nd e-mail accountwithout problems. To send e-mails, though, it will show the e-mails were sent from 1st e-mail address.

How can I set it up, so incoming e-mails will go to the appropirate folders, and outgoing e-mails will send from the right address?