The Business Post Group subsidiary is targeting the service at companies needing ad hoc flyers that can save more than 20% off traditional mailing method costs, according to the company.
The postcards are printed on 250gsm glossy stock, which can feature existing templates or a business's own artwork uploaded to the Imail site.
UK Mail is pitching the new service at last-minute campaigns with orders that are sent before 6pm being mailed by the following day.
Guy Buswell, chief executive of Business Post Group, said: "We are committed to identifying and developing new applications to meet the needs of the marketing community.
"This latest functionality offers a communications tool that is cost-effective and responsive, enabling businesses to better reach existing and potential customers in a fast and efficient manner."
Imail's itself launched last year, claiming to help reduce the carbon footprint of a letter by more than 80%.
UK Mail offers postcard DM tool for low-volume customers
UK Mail has expanded its Imail service offering with the introduction of a new marketing tool that allows low-volume direct mail customers to send postcards direct from their computer.
