This paper uses multimodal critical discourse analysis to explore the ideologies and messages promoted by anti-suffrage postcards produced in Britain between 1909 and 1914. It identifies five salient themes across the postcards: subversion of gender roles; physical ridicule of women; mental ridicule of women; violence towards women; and imagined future. Then, using five prototypical examples as a case study, it argues that, despite these postcards' aim to present anti-suffragists as united in their common objective of opposing women's suffrage, they contained clear paradoxical messages. This can be seen in their juxtaposition of masculinised women who neglected their family duties and feminine women who turned Parliament into a maleless space, as well as the conflation of suffragists and suffragettes. It concludes that this postcard propaganda campaign ultimately failed because of the power of militancy, mass opposition to the brutal treatment of suffragettes and the outbreak of World War One.