Likely scammer in the forum

Hi all,
sorry for writing in english!
I Joined the forum to report a very likely scammer in the marketplace section.
Is there an official way to do so on Guitariste.com ? I tried to look for some contacts but couldn't find anything so far.
Can you help me?

I'm pretty sure he's a scammer because he's selling a high-end collectible/rare guitar at too low a price (around 1/3 of current market value) and I found his personal email (which he used to reply to my queries) mentioned in conversations in another collectibles sites where he had been banned as scammer (apparently got paid, disappeared and then published the same "stuff" on other similar sites).
I'm staying "vague" about his identity on purpose here in the forum, as I don't know what's the correct way to handle this

cheers
NN
laurent
You can contact me directly by PM.
N'en faites pas une affaire personnelle

En ce moment sur bla bla et guitare...