Thank you to all of you who replied. To the poster who asked if I went back and double-checked for any typos in the email address, yep, I did.
I found all of these replies helpful. It was reassuring that many of you think this is likely to be inadvertent. To those of you who said I'm overthinking it... yes, I know.

I'm a little introverted, though, so for someone like myself there's a higher barrier to reaching out, and a bigger emotional penalty when you hear nothing back. Hope that makes sense.