Charities are being invited to join a free email service that raises funds for good causes.
Ippimail.com was launched on 17 March and will donate 45 per cent of its profits to charities.
Ten charities, including Save the Children, Breast Cancer Care, Born Free Foundation and the Suzy Lamplugh Trust, have already signed up to form the founding group of beneficiaries.
However, any registered charity can sign up to use the service, which raises money by selling banner advertising.
By using Ippimail, people can contribute to their favourite causes on a daily basis.
The only requirement for charities that want to join is that they should publicise the project to their existing supporters through their regular channels, such as a link on the fundraising pages of a website or an article in a publication or other communication.
To mark the launch of the service, an email address reserved for the Prime Minister was delivered to Downing Street by the current Miss UK, Brooke Johnston, on Friday.
Will Travers, chief executive of the Born Free Foundation, said: "Ippimail offers an easy way for people to be part of a virtual community that can be a force for good, not only in the UK but overseas as well."