I too have not gotten the mailing for my main character on Antonia Bayle, that was the only character I logged in during the issues with mail and such. I was unaware there was a problem and had tried to access the mailbox but it just hung and wouldnt open, prevented me from interacting with merchants until I zoned to clear it. Since then I have not received anything on that character no matter how long she's logged in, but logging into one of my alts had the frostfell mail arriving in under 2 min for that character. I'm going to /bug it in game.