请翻译成英文. 不要翻译机翻译的.在线等!

Hello! Your letter has been received. Thanks for it. And I will write back to you as soon as possible.

感觉Hello。过于口语，一般英文中短信，都不用说这个的。简洁为要。

Hi! I've heard from you. Thanks. I will write to you ASAP.

hello,I have heard from you.thank you for your letter.I will write back as soon as possible.

Hallo! Thank you for your letter, I have received it.
I will reply you soon.

Hello! I have recieved your letter. Thanks for your letter, I`ll answer you as soon as possible.