If you’re planning on selling anything over the holidays I’d recommend against using Gumtree. I’m having a bit of a clear out and been spammed with scammers multiple times a day. Messages like the one above come within about 20 mins of anything posted so please be careful. Don’t give your email address out to anyone, stick within the Gumtree app. They’ll want it to send you money via PayPal then claim it’s damaged on delivery etc to force a refund.
Another telltale sign above, first trying to get a bite.