Improving email deliverability to .gov domains, as emphasized by documentation, requires adherence to established standards and guidelines. For .gov addresses using Gmail, compliance with Google Workspace's bulk sender guidelines, including authentication, list management, and complaint handling, is crucial. Similarly, for those utilizing Office 365, proper configuration of SPF, DKIM, and DMARC is essential, along with continuous monitoring of sender reputation. Adhering to SMTP standards, as outlined in RFCs, ensures correct email formatting and delivery, particularly important given the stringent filtering rules of .gov domains. Understanding and implementing DMARC is also vital, allowing domain owners to specify how email receivers should handle emails failing authentication checks, thereby ensuring that only legitimate emails are delivered.