[Plugin: WordPress MU Domain Mapping] Redirect all subdomains of a MU site to main site

Dear all,

I am using wordpress MU in subdirectory mode for several sites,
each of which have several domain names.

Currently, only http://www.abc.com and abc.com redirect to abc.com, but for example nonexisting.abc.com redirects to the default site (a different website, the default installation website http://www.123.com for example) of the install, instead of abc.com (Which I would like)

How do I make a website redirect *.abc.com to ITS OWN root instead of the WordPress MU main installation website?

So if I have site with ID 5, with domains a.com (Primary), b.com, c.com etc how do I let *.a.com, *.b.com, *.c.com etc redirect to http://a.com ?

I know this can be done because http://www.a.com CAN redirect to a.com, and the same goes for http://www.b.com …

I have wildcard DNS setup for a.com, b.com and c.com ….
*.a.com

http://wordpress.org/extend/plugins/wordpress-mu-domain-mapping/