If you receive a certified cheque or bank draft, take it to your bank and ask it to verify that it’s legitimate. They can contact the bank on which the instrument was drawn and ask probing questions. If you deposit the instrument, wait for the funds to clear before paying out. Ask your bank to confirm with the institution that issued the instrument that the funds have cleared. This reduces the risk, but may not eliminate it completely. For instance, a cheque that purports to be drawn on an actual bank account may well clear initially, with the bank later finding that the instrument was bad.
You can confirm with the drawee bank, as well, but be certain you’re connecting with the real institution (don’t use the telephone number on the cheque to make contact).
If you receive the confirmation you need, get your bank or a real drawee bank to confirm, in writing, that the instrument is authentic and you’re safe to pay out on the funds.