I don't think it will be received as hoped.. his L3 is aspecting Saturn, and either he hasn't read it yet or he did and didn't like it, but being his L3 is I'm Aries I'm guessing the latter.
You are Sun in Capricorn, so receiving that Saturn energy even though he's Aquarius. His turned L11 ruler is in his house, so it's possible it's something like he has a lot of friends over or with him right now for the holidays and has not read the letter. Especially since your L3 ruler is in the 6H which is cadent, slow, and powerless.
I'm guessing now it's more likely he hasn't read it yet.