If no Bronto is in your future, but you want access to mail, don’t forget the Katy stampwhistle toy. It’s an easy quest chain starting in Dalaran.
There are plenty of guides for this quest.
But before you start, check to make sure that the mail tube is there. Apparently you need to use a character that advanced the main quest in that expansion, because for one of my new alts, it wasn’t there, but it was there for all my old characters.
It’s an easy little questline. It took longer to find the mail drop than doing the questline.