Working with lots of sub-domains

I do not need a solution (just sharing information)

Has anyone had the requirement to recieve mail from multiple sub-domains, and how have you configured this?

On our current platform we are able to receive anything pointed to us (resolved by the MX lookup) and can route to our exchange servers based on a match on the destination domain. For example if our domain was we have many MX entries under the domain in DNS like (test, help, users, etc). An incoming message to would resolve the MX to our server. The SMTP route then matches * and forwards the messages. 

At this stage it appears within I am going to have to set up many domains, one for each MX record as I cannot find a way to accept messages to the subdomains. 



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