I have an account at Google apps and most of my email is done trough Gmail. Now I just manually respond to support email. I was wondering if there is an easy way using filters and auto responders to create a support ticket system.

I think something like this would be great, but is it possible:

Gmail has to make a unique ID for every email that comes in. After that all the other incoming mails should be grouped using that unique ID and not grouped by email.

Something like that, or are there things I am not taking into account. I really don't want to use separate software for this, because I think with some small configurations this can do the trick quite well.

Or are there some free apps on the marketplace that do this already. I have searched for this but cannot find any.

Sorry if this is not an SF question. I really didn't know which is the best fit for this question. This can be migrated to anywhere if someone things it would be answered better there.