[Exim] help with domain cleaving

Hi,

I am having some trouble with exim 3.16 and /etc/aliases

I have created an alias,

support : support@???

the exim server serves the domain.com, and is set to cleave anything
before domain.com from the message via the following:

*@*.domain.com        $1@??? fF

what rule would maintain and deliver the message to the exact host
some-mta.domain.com?

Do I need some sort of redirect?

Thanks

--bash