Dear future husband,
I hope you are in great health and continue having a great time as the slave of Allah. Don't worry about me. I am just fine, thank you. The reason I wrote this letter to you is because I want to tell you that I am going to be your future wife and I hope you can and will bear with me.
Firstly, congratulations for being my husband. Though it is not something that is worth congratulating. Next, I don't love you.