英语感谢信开头

开头是 it is very kind and generous of your warm hostility还是开头是 it is very kind and generous for your warm hostility？

it is very kind and generous of your warm hostility

dear mr.smith, i have won the xxxx competition and i would like to thank you for your continuous support and help throughout this journey. my xxxx would not be a success without you........... .............................. ................................. warmest regards, xxxxxx