This study examines how racial identity affects legislative responsiveness in Mexico using an email-based audit experiment. Emails from simulated Indigenous, Mestiza, and European-White constituents were sent to all 626 federal legislators to test whether perceived identity shapes replies and their quality. Contrary to expectations, Indigenous-named constituents received significantly higher response rates that were more personalized and helpful than their European-White counterparts, while Mestiza-named constituents showed no significant differences in response rates. We found no coalition-based differences, though power was limited, and responsiveness declined in districts with larger Indigenous populations, revealing how national inclusion norms may be moderated by local demographic and political dynamics.