How do I send email from one e-mail but have it show a different e-mail in "from" field for replies?

I have an Exchange 2000 SP2 site. I want to set up a public folder with a public e-mail address (e.g. Public Folder name = "Info" and associated e-mail address = info@ ). How do I set the reply address so that when the people that monitor those e-mails reply, the outside person sees info@ instead of the user's personal e-mail address as the "from" address?

I know that the internal user can manually set the "from" address, but can the public folder be configured so that when you click "reply" on the toolbar, info@ is automatically inserted?