An experiment tested hypotheses derived from self-categorization theory's explanation for gender-based language use. Under high or low conditions of gender salience, men and women sent e-mail to an ostensible male or female recipient yielding either an intra- or an intergroup setting. Gender salience was manipulated so that the stereotypically feminine characteristic of supportiveness was the sole attribute that defined the prototype of intergender relations. Messages were examined for references to emotion and tentative language. Women referenced emotion significantly more than men in the high gender salience condition, but this gender difference was reduced when salience was low. Moreover, women with high gender salience in an intergroup context referenced emotion more than women with high salience in an intragroup setting or men with high salience in either an intra- or an intergroup context. Tentative language use, however, was similar across all conditions as anticipated.