font help

[Chewbaacca]

Hi guys & gals and thanks for taking the time to checking out my post, I need some help me little cousin(15yr old brat) was over this weekend, I let him make a toon on my account and he made a custiom ui for his toon that looks good but doing it changed my in game mail font to something I can hardly read.

For the life of me I cant figure out how to fix it, its been changed for all my toon's on all servers. How do I change just the in game mail font? I been googling for a hr and can change all my other fonts but the mail.

Thanks for any help you may give me.
Chewy -)

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also btw I do not have a font folder that I've read about in so many posts & do use elvui