The U.S. Postal Service (USPS) recently committed to electrifying its fleet of delivery vehicles, a critical step forward for sustainability and combating climate change. But now, according to a disturbing report by Reuters, anonymous sources suggest that USPS leadership may be reconsidering this transition under pressure from fossil fuel interests. Any reversal in this commitment would be a disastrous step backward for the environment and public health. Electrifying the USPS fleet is one of the most impactful ways to cut greenhouse gas emissions and improve air quality in communities nationwide. Transportation is the largest source of carbon pollution in the U.S., and the USPS operates one of the largest vehicle fleets in the world. A shift to electric vehicles (EVs) will reduce pollution, save money on fuel and maintenance, and set a bold example for other agencies and businesses to follow. Returning to fossil fuel-powered vehicles would lock the USPS into decades of higher emissions and outdated technology, undermining progress in the fight against climate change. Americans overwhelmingly support bold action on climate, and the USPS must continue leading by example—not reverting to energy sources that pollute our planet and endanger public health. We call on the USPS to follow through on its commitment to electrify its delivery fleet and reject any future reliance on fossil fuels. The future of our postal service should be clean, efficient, and aligned with the fight against climate change.