gao.gov - Email Domain Verification & Deliverability Report

The domain gao.gov belongs to the U.S. Government Accountability Office (GAO), an independent, nonpartisan legislative branch agency that serves as the audit, evaluation, and investigative arm of Congress. Based in Washington, D.C., the GAO examines how taxpayer dollars are spent and provides Congress with objective analysis to improve government performance and accountability.

As a federal .gov domain, gao.gov is subject to CISA Binding Operational Directive 18-01, requiring DMARC, SPF, and DKIM implementation. Email authentication protects GAO communications from spoofing, as fraudulent messages could be used to distribute false audit findings or impersonate GAO investigators conducting oversight reviews.

GAO mail servers do not function as catch-all systems. The SMTP infrastructure validates recipient addresses and rejects messages to nonexistent mailboxes. As a legislative branch agency, GAO email servers employ greylisting, rate limiting, and connection filtering to manage inbound traffic.

Successful email delivery to gao.gov requires strict adherence to authentication standards. Federal email gateways apply thorough content filtering, attachment scanning, and reputation-based sender evaluation. Senders must maintain correctly configured SPF, DKIM, and DMARC records for reliable delivery to GAO addresses.

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