I think a lot of this depends on the size of your community. If it’s small (like ours) then you can afford to be very hands on and granular with your approach. I message everyone personally, but that’s not feasible in many instances. It’s also not always the best use of your time.
It feels important to me here, because I think people can sometimes feel daunted and offering a personal connection first up can temper that a bit.
We’ve talked about a few different approaches over the last ~year. Here is plenty of reading about community onboarding.
I like the personal touch. I regularly get positive feedback from people about that and it’s something that I’ve noticed makes a huge difference for me (I’ve been doing a few community breakdowns recently so have been through a lot of onboarding processes!).
If it’s not feasible to actually send a personal email, then making it from a person is prob the next best. I send automated emails from ‘Hawk at UX Mastery’ so that people know it’s from me, but they have visibility of the brand in their inbox for quick identification.