REPLACEMENT postal votes are being delivered by Rotherham Council after some were delayed.
RMBC believes up to one per cent of the total postal votes could be affected.
Sharon Kemp, the council’s chief executive and returning officer, said: “Due to circumstances beyond our control, a small number of postal votes may have been delayed.
“We believe this could be up to one per cent of the overall number of postal votes.
“We are asking anyone who applied for a postal vote by the deadline of 5pm on April 20 and who has not received their postal vote with their post today to get in contact with us at email@example.com or call 01709 382121 as soon as they can. We will then deliver a replacement postal vote to those people.”
Ms Kemp urged those receiving postal votes to “move very quickly”, ideally by filling in and posting back the same day.
She added: “Voters have until Wednesday to put their vote in the post. They can also put their vote through the letterbox at Riverside House on any day up to and including polling day until 10pm or hand their postal vote in at any polling station by 10pm on polling day (Thursday).”
All 59 seats on Rotherham Council are up for grabs and there are also polls for parish councils, the police and crime commissioner and, in Dinnington, the neighbourhood plan.