Omniva an international post and logistics company based in Tallinn Tallinn, the largest city and capital of Estonia (population 440 000). , Estonia. is an international post and logistics company based in Tallinn Tallinn, the largest city and capital of Estonia (population 440 000). , Estonia, that targets the Baltic states. The company adobted the name Omniva an international post and logistics company based in Tallinn Tallinn, the largest city and capital of Estonia (population 440 000). , Estonia. in June, 2014. It was previously known as AS Eesti Post (AS Estonian Post). The roots of the company go back to 1638, the very beginning of postal service on Estonian territory.