nothing in inbox
The release notes said
"To celebrate the release, players will be able to claim six Alchemy: The Brothers' War packs from their player inbox (yes, this is new—more details below), with no code redemption or event participation required!"
There is nothing in my inbox
When the server comes back up, try playing a match. I think I had no mail prior to entering a match, played one, and suddenly had 3 after the game.