Under the agreement, Vauxhall's sister company Opel is supplying 4,000 Luton-built Vivaros to the firm, with the first 1,000 being delivered by the end of this month.
The deal makes Opel the exclusive vehicle supplier of the group's medium van fleet until the end of this year. The vans will form part of Deutsche Post World Net's fleet in 14 European countries.
In Germany the vehicles will be used by Deutsche Post and in all other markets by DHL, Deutsche Post's express and logistics division. By adding the 1.9-litre diesel-engined Vivaros to its fleet, Deutsche Post World Net plans to substantially renew its medium van fleet.
Final preparation of the vehicles to meet the requirements of the firm is being handled at the Opel Special Vehicles centre in Rüsselsheim, Germany.
Carl-Peter Forster, Opel chairman and managing director, said that past month was the 26th consecutive month of year-on-year commercial vehicles market share gains in Western and Central Europe. He said: 'That Deutsche Post World Net has chosen the Vivaro for its vehicle fleet confirms yet again that we are hitting the mark with our vehicles.'
In the UK Vauxhall van sales have doubled in two years. Vivaro sales last year, at 10,057, were up by 81% over the previous year.