The letter is to him or, I am writing to him.
Case The pronoun what in  -- [F. Whoever is elected will serve a four-year term. This pronoun is the object of the preposition with , so whom is the right pick.
The fact that it's also the subject of another clause doesn't matter. April 14, 2014, at 1: Carl and who. Whoever brought these brownies to the party should be commended!
If both case requirements are for a nominative, then there's no problem: Alex says: Be careful, though.
To determine whether to use whoever or whomever , here is the trick: He dragged the trash can. The correct answers can be found at the bottom of this post.
June 30, 2012, at 10: Everybody knows whom I mean. The sentences in your comments contain numerous errors. It is virtually never safe to use whom.
Like the speaker is trying too hard. The sentence is: Here's some related info, from CGEL page 1075:.