Take your own advice, please!
I always see a handsome man 
And you’re STILL here to troll amazing
My guy is a scientist for sending books to alts 
Mailing anything to alts is the same as trading to another player. The books will become untradable.
You are allowed to mail pretty much anything to an alt though, except books now.
I’m glad you actually can understand that.
Use roster storage to send items to your alts
If the roster storage is full, It’s a hassle to clear it, then put engraving books in the roster, then login to the alt to take the books, then put back items again.
Not a hassle for me. Been doing that just fine. I kept 1 alt as storage too for my items
I just did a test run - clearing, engravings in roster, switch, take out, switch back and put items in - 1m 49 seconds. That was no speed record run either. I’m sorry that you have to go through that much hassle ;(
Incoming “I’m quitting Lost Ark and here’s why” post about this 
Well hey, at least you are providing tangible numbers!
1 min and 49 second for doing it just 1 time is nothing. Now let’s multiply that multiple times a week, a month, and years to come. What will we have…? Oh yes… just a lot of time doing mundane useless things instead of actually enjoying the game.
This is what I’m fighting for and I don’t think people understand!
naaahhh, after reading all the above replies, i think you just want to sell engraving via mail. nice try gold farmer. lol
Then you have quite a narrow mind.
Think about it for a second. If I were to sell engraving books via mail, why not just sell other things like potion or gems? Those things can be mail at the moment.
You have to learn to take some L’s man… Either way, what’s in your storage that its full? Have you unlocked the second page all the way? Seems like you are mismanaging things