Selling Sigma 30mm f2.8 lens for Sony e mount. In perfect condition, used very little and carefully. Selling because I prefer a different focal length)
Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.