[yznlp]

I'm not sure about older people, but business/formal emails in Japanese are like at least 70% fluff. There are loads of guides on the internet like [1], just look at the English translation of the example at the top...

Depending on the level of formality you might need to conjugate verbs slightly differently or use vocabulary that's considered more respectful. From my experience the younger generation is more relaxed about the rules, but Japan as a whole is pretty slow to change.

[1] https://www.wasabi-jpn.com/japanese-lessons/how-to-write-ema...