[SSJup81]

Hello again everyone. I'm working on some sentences, but I'm not sure if I'm correct. One sentence I'm trying to write is "Thank you for writing." or "Thank you for returning the message." or something along the lines of that. I know how to say, "Please write," te form, but I never was taught how to actually thank someone for actually writing back.

Would it be something like... Ooki ni anata no shibbitsu o kaiteimashita.

I really think this is beyond wrong, but please correct if possible. ^^.