A kumba mail

I think you meant to say "a Kum Ba Yah mail"!

Kum Ba Yah is a popular African-American spiritual song, and "Kum Ba Yah mail" is likely a playful way of referring to a message or letter that is uplifting, joyful, and full of good news.

If you'd like to share what's in your Kum Ba Yah mail, I'm all ears!