Set up Trigger for a response to go through a certain channel regardless of it's origin

Is it possible to set up a trigger such a way that if a certain tag or certain type of form is selected then response will go through a particular channel (Email address) regardless of which channel ticket is received?

For example : Ticker 123 is submitted via web form, and is assigned to tier2 support, any public comment on that ticket will go through default email address. However i would like that response to through tier2 support email address.