The annual Sino-India border trade at Nathu La, which was to be reopened today, has been postponed following the Commerce Ministry's communique to the Sikkim government, official sources said here. "We have received a fax message from the Union Commerce Ministry late last evening informing about the postponement of the reopening of the border trade at Nathu La,' the District Collector (East) Vishal Chauhan told PTI here. The reopening of annual trade at Nathu La may take place on May 19, he said.