Mortascreen currently has more than 6m records of deaths in the UK dating back to 1989 and the first feed of the new data will increase this total to 7m.
It is now offering up to 50,000 records per month, which will make it the most comprehensive deceased suppression file available on the market.
Karen Webster, Mortascreen product director, said: "The new monthly data feed will mean that Mortascreen is bigger, better and more recent than any other file available on the market, rendering all other deceased suppression solutions obsolete."
This new partnership also means that more records will be available within days of a death.
David Murray, sales director at The Software Bureau, said: "This is a genuinely innovative new development and my prediction is that this innovation along with other files available on the market will help make great headway in the battle to clean up direct mail's reputation.
"It does what it says on the tin, and it is exactly what the industry needs if it is to promote best practice and answer its detractors."