Unless they are a local client, I would put a response to this email on the end of my to do list. It is very generic (I expect 10 other dealers got the same email and/or using this quote for negotiating a deal with your local dealer) and would be a PITA if we made a deal.
Also anyone who states they are a serious buyers or make excuses is not a serious buyer.
Basically here is an email template (change it where applicable) that will start a dialogue and elicit a response rather than auto delete:
I am interested in the 3 series (stock #: 12345) that I saw on your website and wanted to check if it is still available since it has the exact color combination/options/features I am looking for. If it is still available, can you please quote a lease for X miles per year and please included taxes/fees (zip code: 010101 and I currently own X brand). You can reach me at xyz@abc.com or 123-456-7890 (if you want to include your phone).
It is simple, shows you are interested in a specific vehicle, and starts a conversation. Let them give you a quote (it will probably be higher than your expect, do not take it personally) and go from there. You might not get a quote 100% of the time, but it is better than a 5 paragraph essay.
A good response to a quote would be:
Thank you for taking the time to prepare a quote for me but from the research I have performed, I am looking for a more aggressive deal. Based upon my research and the current market, I am looking for a monthly payment of X based on discount of X with a residual of X% and a money factor of X. If we can agree to those terms, I take delivery on DAY.