However, the independent body, which oversees elections in the UK, was not able to draw firm conclusions on the scheme’s impact.
The pilot carried out during May’s local elections consisted of a leaflet in postal ballot packs with additional information on postal voting and what voters should do if they were concerned about electoral fraud.
A sample of voters were also contacted by the returning officer to check they had applied for a postal vote. Residents voting as proxies were required to show identification at polling stations.
Craig Westwood, director of communications and research at the Electoral Commission, said: “We welcome measures that could provide voters with greater confidence in the security of voting by post or when appointing a proxy to cast a vote on their behalf.”