Postpartum depression (PPD) disproportionately affects birthing individuals in rural regions with limited access to behavioral health services. This pilot randomized controlled trial evaluates the feasibility and acceptability of DoulaConnect, a three-month, text-based peer-support intervention delivered by trained doulas to postpartum individuals with a history of substance use. Thirty participants will be randomized to DoulaConnect or treatment-as-usual OB-GYN follow-up. Outcomes include changes in depressive symptoms, perceived social support, parenting stress, health-related quality of life, and self-efficacy. The intervention leverages Medicaid-reimbursable doula training and digital communication pathways to address geographic barriers and enhance continuity of postpartum support. Results will guide development of larger, multisite trials and inform community-driven strategies aimed at reducing mental-health disparities in rural populations.