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Re:In Estonian parliamentary election, 44% of the votes were... by tim333 on Sunday March 10, 2019 @06:02PM (#19354889)
You could select voters at random, say one in a hundred gets and email saying would you like to check your vote?
Re:In Estonian parliamentary election, 44% of the votes were... by Mirioron on Monday March 11, 2019 @05:55AM (#19357764)
They can already check their online vote, but some restrictions apply: https://www.valimised.ee/en/internet-voting/checking-i-vote

Keep in mind that you need to check the vote on a different device than what you voted on.