I don't usually find it neither formal nor personal, just weird using names in texts or emails.
Again, my boss does that.
"Hi Mats, what's your opinion on ...", "Thanks Mats".
If it was sent to a group of people, sure, maybe, but when sent to only me? I just don't understand...
/Mats
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Interests: Comic books, Manga; most things to do with Handicraft, wood, textile, metal etc, modern materials; horror, true crime; languages, art, and history to an extent
Uninterests: All things about motors; celebrities; fashion; sports; career; stock market
Feel free to PM me!