What kind of horse is it?

Mailer is not a horse, but a character named Eye-catching Eagle in the game.

In Ma Ma Niang's mobile game, players can go to the shrine to pray and add buff to Ma Niang. When drawing lots, Ma Niang will show a prayer symbol, which is the best and most powerful. Among them, this symbol in the eye-catching flying eagle's hand has been approved as "mail", which is very funny, because this letter roughly means "finished" and "hopeless", thus producing a large number of similar expression packs. This expression pack spread widely, and later the eye-catching flying eagle was also called the postman.

Eye-catching Flying Eagle is the debut role in the cross-media planning "PrettyDerby" and its derivative works, mainly based on mobile games made by Cygames. The prototype is Japanese thoroughbred racing horse スマ_トファルコン(SmartFalcon).