The deal means TMN Media's collection of data now exceeds 8m names including those owned or managed for clients including ASOS, Handbag, The Trainline and Emap.
Loot.com, which is owned by Associated Newspapers and part of the DMGT group, has collected the data from those registered to its classified ads site and other services over the past 18 months.
Karin Bachler, Loot business development manager said: "Our member base is particularly valuable to email advertisers as it comprises individuals who are very confident in purchasing products and services online.
"Moreover, the file grows by around 25,000 newly opted in members a month. We're confident TMN Media's expertise will result in the best management of our email data."
Users of the site have a profile of confident online shoppers with a higher than average annual online spend of 拢1,480 in the last 12 months, according to Loot.com.
Independent research has also shown that Loot.com users are keen online gamblers and music downloaders:
52.3% of users are aged between 25 and 44 and 60% are full-time workers with 56% categorised as ABC1.
Simon Jeffs, head of data at TMN Media, said: "Our selection by Loot.com shows that TMN Media is the only serious choice for those media owners looking to monetise their data."
If you have an opinion on this or any other issue raised on Brand Republic, join the debate in the .