WoWDB

Draka sends the player a letter upon reaching Revered with Frostwolf Orcs.

From: Draka
Subject: The Frostwolves Thank You

<Player>,
  Thank you for your selfless aid to my clan during our time of need. Frostfire Ridge is secure, but the treacherous Iron Horde are throwing our whole world into chaos. <Player>, my husband Durotan would never openly show weakness, but this conflict is tearing him apart. Some of his dearest friends have sided with our enemy. We need new allies more than ever. Your heroism is an inspiration to us.
  I have sent Beska Redtusk to Warspear Hold in Ashran - speak with her if you need any supplies from our clan's stockpile. It is the least we can offer.
  - Draka of the Frostwolves

Durotan sends a letter when the player reaches Exalted.

From: DurotanSubject: Heart of a Frostwolf

<Player>,
  My father Garad spoke often about honor. He said a warrior should be thankful for being given the opportunity to sacrifice, to do what is right at great cost. This, he said, shows a warrior's true heart.
  His words of wisdom bring me little comfort in these dark times, when we are forced to ask so much of so many. But I am thankful for your friendship. You and the strangers you brought from another world embody our ideals of heroism and sacrifice. I am proud to call you friend. You have earned it. <Player> - if not in blood, you are a true Frostwolf in spirit.
  - Durotan of the Frostwolves