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.
HOUSE AVAILABLE FOR SALE AT GARUGA ENTEBBE ROAD WITH 5BEDROOMS, SEATING, DINING, KITCHEN AND BOYS QUARTER ON 50 DECIMALS (HALF ACRE ) AT ASKING PRICE 650m negotiable.
