I'm assuming that Inshallah is Arabic for "God willing", so that's how I'll translate it. Dear Mrs. Suzan, I am glad to write this letter to you. I will be traveling tomorrow, God willing, so I wanted to say goodbye. I am proud to have known you. I learned so many more things from you than just language. You are an encouraging person with a great spirit and sense of humor, and I scarcely believe I'll find another like you. I hope that all your wishes come true, God willing, and that you remain happy throughout your life. With all my best wishes, Mohamed Elhorany ___________________ I figure that you can keep 'inshallah' the same without much problem, but it's a bit odd to splice languages together in a situation like a formal goodbye letter.