I don't believe that Mandos had much to do in regards to the fate of Men after the passed away at all. In the Silmarillion, it's stated that at the end of the world, the First-born(elves), and the Second-born(men), would rise to sing a new song with Eru. Tolkien never gave an exact place unto which men departed, maybe for the fact that it corrulates with current societie's belief in the existance of an afterlife. It adds another sublevel to the mystery of some things in the story. But as to whether Mandos had some control or influence in the Doom of Men, I don't think Illuvar privileged him with any.
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