I would not blindly trust any emails you get. Always confirm and message solely through the forum messaging service. Do not send btc to some random email address. Scammers are getting better at ripping people off. I would also only use escrow for such a large purchase.
change settings or buy the copper membership so you can message and post freely
do not send down payments, do not part with your btc so easily. Use trusted escrow like Mopar Mining... don't let scammers scam you, be cautious of anyone trying to do deals outside of the forum messaging.