Internet mail using exchange 2000

Hi

I have already a mail solution for my intranet and it is working fine.

My problem is that my company wants to use this same installation of exchange to be able to send and receive emails from internet.

We have a internet domain that we use to publish our web site, but it is different from my intranet domain and exchange organization.

I am not sure what i need to do be able to receive and send emails from internet if my intranet and internet domain are differents.

Can someonegive ideas because i need to solve this and i am sure that this is something that someone see before

Jaime Vuelvas