Can buyers email you?

I have some postings and am selling a Beatles jacket on Poshmark. I have no comments on my post on the app but someone just emailed me with the subject “Beatles jacket” and the email said hello is the Beatles jacket still available?

How did this person get my email? Aren’t they supposed to comment on your post in the app? How did they get my email? Is it a scam? If so how did they know the specific item?