Lacey Turner has posed at a traditional red pillar box to remind people to send their Christmas cards in time.
Royal Mail has recommended that people should send everything before December 18 and December 21 for second and first-class Yuletide deliveries.
The actress, who plays Stacey Branning in the long-running soap, posted her own cards, adding to the workload of postmen and women who are expected to deliver around two billion items during the festive period.
Research by the Royal Mail found that one in 10 people risk upsetting a friend or relative this Christmas by making mistakes with the postcode.
Others simply forget to post in time, prompting the reminder from Lacey.
The EastEnders star said: "There's nothing quite like sending a Christmas card to let people know you are thinking of them, even if you haven't been in touch for a while.
"I know postmen and women have millions of cards to deliver, so I've posted mine early to help them get there in time."