我收到了笔友从澳大利亚寄来的信的翻译：I have received a pen pal from Australia sent letter 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

I received a letter from pen pal from Australia

I have received a pen pal from Australia sent letter

I have received the pen pal the letter which mails from Australia

I have received a pen pal from Australia sent a letter

I have received a pen pal from Australia sent letter