How to alias a domain

[John]

I have three domains two of which are aliases for the other (klam.ca - 
aliases klam.biz and klam.com).
Within the these domains I have TLSA records for things like the email 
system and some web services.

I originally thought of using dname records for the domain aliases and 
cname records for the TLSA records.
But for this to work I would need  to enable recursion on the 
authoritative server for  masters, I understand that for very good 
reasons this is considered a very bad idea.

So how best to provide aliasing?

--
John Allen
KLaM
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I just go lost in thought. It was unfamiliar territory.