Exchange 2000 Server

In the default recipient policy add your second domain name. Now any user that you want to have the additional SMTP address just add it in Active Directory.
If you want the second SMTP address to be the default just click on set as default.

Implement Active Directory as normal. For example, default domain name of tzo.com and secondary domain names i.e bill.tzo.com or john.tzo.com. Setup you exchange as normal i.e. organisation name, site name. On the Exchange side of things as long as the 2 servers belong to the same site things are OK. All you the need to do is to register the domain names ready for Internet communication

To answer your EMAIL question:
1. If it is for a few people you can use add secondary proxy addresses by going to Start>>Programs>>Microsoft Exchange>>Active Directory Users and Computers>>Mail-enabled users propreties>>E-mail Address Tab.

2. You can use E2K for as many SMTP addresses as you want to host. As long as you have correct records in DNS etc.
You can use the Recipient Policies to create new SMTP addresses to apply to all your users. The receipient update service would then stamp the new proxy addresses to your mail enabled users.
Refer to KB articles Q253828 & Q253838

Thank You,

Goto "support.microsoft.com", search Article no.
Q289833
Q260973
and
http://asia.cnet.com/newstech/systems/0,39001152,39013988,00.htm

You can found your answer.

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