I'm glad to come here and see I'm not the only one who didn't like that greeting! Yes, I am female (and if someone at Kobo was looking at my info, my first name is obviously feminine) but it's been years since I would have described myself as a "girl". I guess they must not have my birth date on record
"Hey girl" might be OK as a casual greeting between friends, but it wasn't a good choice for a business email.