Trying to setup a dynamic MX response

[F. Even]

Why not just setup an MX record for each of the domains you will be 
querying?

a.foo.com has MX a.foo.com.bar.com
b.foo.com has MX b.foo.com.bar.com
etc.
etc.

As someone else pointed out, you really won't be able to setup a 
wildcard.  Maybe just setup other domains pointed to:

catchallmx.foo.com.bar.com



Steve Robillard wrote:

> I am looking to setup Bind to respond to MX request with a dynamic
> answer based on the query.  It is important for me to get back a
> response which contains the initial queried domain + a predefined
> domain.
> 
> The desired result on MX queries :
> 
> Query    : a.foo.com
> 
> Response : a.foo.com.bar.com
> 
> Query    : b.foo.com
> 
> Response : b.foo.com.bar.com
> 
> Query    : *.foo.com
> 
> Response : *.foo.com.bar.com
> 
> 
> Would anyone have a suggestion on how I could go about doing something
> like this?  I am sure it would be possible to modify the BIND src to
> do what, but I am hoping there is a simpler way to do this that I am
> simply unfamiliar.
>