Come here and read, there are probably many more of us than there are in this topic.
https://us.forums.blizzard.com/en/d3/t/no-mail-after-season-33-end/
or here…
https://www.reddit.com/r/diablo3/comments/1i6dqqo/diablo_3_s33_fail_19_january_items_did_not_arrive/