Board Thread:Lore/@comment-26272311-20150412005128/@comment-26298013-20150415201643

I'm re-reading the Silmarillion, but to my knowledge it never directly states that Elves are permitted to leave.

At the very least, once an Elf's spirit leaves his/her body, the body is useless, and cannot be re-inhabited, and the spirit remains in the Halls of Mandos.