Contracts signed under Power of Attorney - What you need to know. At Tuckfield Conveyancing Kadiina we are seeing more and more contracts signed under Power of Attorney on behalf of a Vendor. What exactly does this mean? We are so glad you asked! In South Australia, a Power of Attorney is a legally binding document which gives authority to a nominated person the power to act as agent and make decisions on another's behalf. The person giving the authority is known as the Donor and the recipient of the authority is known as the Donee... #tuckfields #adelaideconveyancers #localbusiness #kadina #coppercoast #yorkepeninsula #southaustralia