Does the US Postal Service always postmark an election ballot on the day it is mailed?

The U.S. Postal Service adopted a rule effective Dec. 24 clarifying that some mail is not postmarked when it is first received – at a post office, for example – but rather on a later date, during processing.

The rule doesn’t change practices, but instead is “intended to improve public understanding of postmarks and their relationship to the date of mailing.”

Postmarking can affect whether local officials accept election ballots.

Fourteen states, including Illinois, accept a mailed ballot if it is received after Election Day, as long as it is postmarked on or before Election Day.

Thirty-six states, including Wisconsin, require absentee ballots, including those cast by mail, to be received by the local election office by Election Day. They aren’t affected by the rule change.

Manual postmarks can be requested at post offices.

The postal service has been reducing operations, increasing postmarking delays, the Brookings think tank reported.