This e-mail simply thanks an online advertiser for taking your name off their e-mail list.
I recently noticed that you have complied with my request to remove me from your e-mail mailing list. This is NOT a request to be placed back on your list, but simply an expression of thanks for your action. Thank you for the professionalism you've shown in complying with my wishes. It's all too uncommon, and I appreciate it. Good luck, and thanks again.