More than 1m items will be mailed by Polestar Applied Solutions' plant in Nottingham, with work comprising 23 titles.
Heidi Kenyon-Smith, head of acquisition marketing at NatMags, said: "We have decided to use Polestar after an impressive professional presentation demonstrated their enthusiasm for this market and made us feel that, although not one of their largest on the direct mail side, we would be a valued customer."
Polestar has already handled the first three mailings, each one requiring a different production process, including litho printing with laser personalisation and digital production on a Xerox iGen and an Océ JetStream.
The printer's print key account director, Avril Jenkins, said: "This is where the breadth of Polestar’s services comes into play and we are able to develop already successful relationships into true partnerships."