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.
We are based in kayunga bugerere selling and buying land, we have plots available in sinda kivuluba mukono district near main Tarmac road of Kampala kayunga highway, 25x70fts at only 2.5m ugx, 30x70fts at only 3m ugx, 50x70fts at only 4.5m ugx contact 0701468042