Voters are being urged to check any mail they receive purporting to be from the Victorian Electoral Commission to make sure it is the real thing.

The warning comes after a Liberal Party letter was widely distributed with an official VEC postal vote application.

The postal vote application sent to voters by the Liberal Party.

The VEC has released a statement saying it is aware of political parties sending postal vote applications with campaign material to voters.

Electoral commissioner Warwick Gately said these voting application forms have not been sent by the VEC.