Daisy Dorothea Solomon (1882–1978) was posted as a human letter in the British suffragette campaign[1] using a quirk in the postal system to approach the Prime Minister who would not receive a delegation of women demanding the right to vote.

Solomon's father was a newspaper proprietor and a liberal politician in the first Cape Parliament [5] and her mother was an educator and suffragette.

On 23 February 1909,[6] Jessie Kenney took Daisy Solomon and Elspeth McClelland to the Strand Post Office and paid three-pence to have them 'posted' to the Prime Minister at Number 10 Downing Street the day before the 'Women's Parliament' meeting in Caxton Hall.

After that meeting a delegation including Solomon tried again to approach the Prime Minister, while he was dining out, and twenty-seven women were arrested with leader Emmeline Pethick-Lawrence.

For Solomon and others like Constance Lytton, Caprina Fahey, Rose Lamartine Yates, and Sarah Carwin, this was their first arrest for activism.

[14] International attention was generated, with the Los Angeles Herald commenting on Solomon's and other protestor's 'high social position' and remarking that 'it is increasingly difficult to predict how their demands may be longer parried' and stating that the situation of these arrests and the perseverance of those fighting for the women's right to vote was becoming 'embarrassing' for the British government.

[21] In 1918, Solomon became literature secretary of the British Dominions' Women's Citizens Union, attending an international conference in Paris in 1923.