Support Groups - assigning by email address

Support Groups - assigning by email address

Hi,
 
I'm trying to assign requests to a specific technician(s), when the "To" field on the email matches a specific email address.
 
The specifics:
 
we've got an email address, ishelpdesk@foo, attached to an Exchange 2010 mailbox, that we use for our helpdesk jobs.
The mail fetching works fine, and delivers all mail to us as requests.
 
I wish to add another email address, phones@foo, to the same mailbox, to allow people to send Phone requests to us - however I want to control who is automatically assigned these jobs.
Can this be done?
 
I've tried to create a Support Group for this group: http://i.imgur.com/Yn37kPC.png
 
However all the jobs keep going to the main request list.
 
Any ideas?

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