YOU SAID:

I was sending them to the wrong address on purpose

INTO JAPANESE

わざと間違った住所に送っていた

BACK INTO ENGLISH

I sent it to the wrong address on purpose.

INTO JAPANESE

わざと間違った住所に送ってしまいました。

BACK INTO ENGLISH

I intentionally sent it to the wrong address.

INTO JAPANESE

故意に間違った住所に送ってしまいました。

BACK INTO ENGLISH

I intentionally sent it to the wrong address.