The Advertising Mail service has been introduced as a product designed to support direct mail.
The service launched three weeks ago and its aim is to make direct mail more cost effective and competitive with other forms of advertising.
Royal Mail claims that more than 14 million items have been posted since its launch.
The company said that a further 100 potential advertisers, on top of the 80 already using the service, are said to have expressed an interest in the service.
Antony Miller, head of media markets, Royal Mail, said: "We are delighted with the exceptional response to Advertising Mail in such a short space of time.
"Royal Mail remains committed to developing services that support the role of direct mail in the advertising mix.
"Integrating direct mail with other channels boosts payback, 92% of mail is opened and it has regained its position as consumers' favourite marketing channel."
The success of Royal Mail’s direct mail service comes weeks after the company was reported to have drawn up plans to cut 40,000 jobs. It said that the mail service would be working with unions to make itself "smaller and more efficient over time".
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