Replacing certain records in a zone

[Pieter De Wit]

Hi Guys,

I have a requirement to replace certain records in a zone, as e.g:

To the public I want www.domain.com and mail.domain.com to resolve to 
1.2.3.4 (Do note that I am not the SOA for domain.com)
To my development environment I would like www.domain.com to resolve to 
5.6.7.8, but I still want to be able to resolve mail.domain.com to 1.2.3.4.

I have a DNS server in place at the development environment that I can 
control.

I could have sworn that bind has an option to do this, I just can't 
recall where/how/what.

Thanks,

Pieter