Some Good Opening Lines:
With reference to your letter of 8 June, I ...
I am writing to enquire about ...
After having seen your advertisement in ... , I would like ...
After having received your address from ... , I ...
I received your address from ... and would like ...
We/I recently wrote to you about ...
Thank you for your letter of 8 May.
Thank you for your letter regarding ...
Thank you for your letter/e-mail about ...
In reply to your letter of 8 May, ...
