Search the forum for KVS Availabilty tool , download it and register as a 'lite' user for free. It will show all the fare availabilities on different routings for all or specific airlines you choose.

I recently downloaded it after reading about it on here and it is really useful. If you subscribe it will give you all sorts of other data as well including seat maps and fare codes.

Edited to add... Sorry just re-read your post and saw that you want the info emailing automatically so you may already know about KVS. I don't know if it will do what you want if you subscribe but it deosn't as a lite user.