YOU SAID:
what a pleasure doing business with you
INTO JAPANESE
あなたとビジネスをすることができてとても嬉しいです
BACK INTO ENGLISH
I am very happy to do business with you
INTO JAPANESE
あなたとビジネスができることをとても嬉しく思います
BACK INTO ENGLISH
I am very happy to do business with you
That didn't even make that much sense in English.