VOTERS will be using the postbox instead of the ballot box in June's Kirklees Council elections.
The trial scheme is going ahead after a wrangle between the Commons and the Lords finally ended.
A major constitutional clash was avoided when peers agreed to the experiment going ahead in four regions of England, including Yorkshire and Humber.
Backers of the trial believe it will boost turnout at the polls, which include European Union elections on the same day.
The Government's win came after the Lords voted five times to rein back the experiments.
Later, Leader of the Commons Peter Hain welcomed the outcome, saying: "I'm glad common sense has prevailed.
"What we see here is the Conservatives mobilising their vote in the Lords to defeat a Labour majority in the Commons - and we will address that issue with a Bill to reform the powers and composition of the Lords."
Nominations close on May 13 for the Kirklees and European Parliament elections.
Ministers originally backed Electoral Commission proposals for all-postal voting experiments in the East Midlands and North- East.
But their later bid to include the North West and Yorkshire and the Humber sparked Tory and Lib-Dem opposition,
All-postal voting trials will cover about 14m electors.
