The move marks the first time the organisation has had one roster that services all its brands - Post Office, Royal Mail and Parcelforce Worldwide.
The list comprises five agencies from across the events sector - Jack Morton Worldwide, Comtec Presentations, Logistik, Oxford Motivation and Rogen Si. It was created following a lengthy review, in which procurement departments played a major role.
At the C&IT Agency Forum in August, Royal Mail's then head of internal events, James Breeds, told delegates that the agency review initially involved 120 companies, which were reduced to a shortlist of 12 before the final roster was created.
Royal Mail Group spokesman Patrick O'Neill said the roster contracts would be valid for between two and four years: "The agencies have been taken on for their knowledge and specialisms," O'Neill said. "It is highly unlikely we will use any other agencies."
The moves sees Royal Mail end its three-year relationship with agency Sledge due to trading restrictions. "Procurement dictates that they can't use the same agency for four years," said Sledge director Ian Irving. "However, we are working on another tender for a different Royal Mail roster."
Meanwhile, O'Neill confirmed that Breeds has left the company and that Royal Mail head of communications deployment Maureen Landy has taken over his event responsibilities.