Saying, "You are Detached from my Marriage"

Question: A man wrote a letter to his wife stating, "You are detached from My marriage". Is the divorce effective and, if so, which type of divorce would it be?

Answer: A single Raj'ee divorce will be effective in the stated case, meaning that he may take her back into his marriage during the Iddah without the need to formally remarry her. Once the lddah expires, the divorce becomes Baa'in, meaning that he will be unable to live with her again without a formal remarriage. There will, however, be no need for Halaalah. And Allaah knows best what is most correct.

Fatawa Rahimiyyah vol.3