From Tuesday through the weekend, 500,000 emails will be sent to owners who have been remiss in six regions of Greece.
Authorities warned there will be no more extensions to the filing, which is part of a longtime effort by several governments to update the official land registry.
The regions targeted by the emails include Arkadia, Drama, Etoloakarnania, Evrytania, Fokida, Grevena, Ilia, Ioannina, Iraklio, Kavala, Magnissia, Rodopi, Viotia, West Attica, and Xanthi.
