Yes. You can verify any @Loc.gov address in real time with a direct SMTP handshake that provides 99.7% accuracy. Loc.gov is operated by Library of Congress, runs 2 mail servers, enforces 2 of 3 authentication standards, and is currently responding to SMTP.
Every check returns one of three clear outcomes so you know exactly what to do with the address.
The mailbox exists and accepts mail. Send with confidence, the address is deliverable.
The mailbox does not exist, is disposable, or will hard-bounce. Remove it to protect your sender reputation.
The server is catch-all or greylisting, so existence cannot be confirmed. Send selectively and watch engagement.
loc.gov publishes 2 MX records. The primary mail exchanger is mxa-00026101.gslb.gpphosted.com, hosted by Proofpoint, and it is currently reachable and answering SMTP. Mail is routed through these servers in priority order, lowest number first.
| Priority | Hostname | IP | Status |
|---|---|---|---|
| 10 | mxa-00026101.gslb.gpphosted.com | 66.159.227.43 | Reachable |
| 10 | mxb-00026101.gslb.gpphosted.com | 66.159.228.43 | Reachable |
220 mx0e-00026101.gpphosted.com ESMTP mfa-m0478988Yes. loc.gov is a valid email domain, operated by Library of Congress. Addresses are persistent and real mail reaches a genuine recipient. Individual mailboxes still go stale, so verify each one before you send.
A live SMTP handshake connects to Loc.gov's mail server and asks whether the mailbox exists using the RCPT TO command, without ever transmitting a message. The recipient never sees the check.
Each address runs through 30+ checks including SMTP existence, catch-all detection, role-account filtering, and disposable matching. The same engine has verified billions of addresses since 2012.
Every unverified address is a gamble. Here is what happens when you skip verification and mail a list that has not been cleaned.
People leave companies. Verification flags loc.gov mailboxes deactivated since you collected them.
Expired or full loc.gov inboxes hard-bounce. A live SMTP check catches them before you hit send.
Low bounce rates keep you trusted by loc.gov mail servers and the major mailbox providers.
Verified contacts mean your CRM, lead scoring, and routing all run on addresses that reach a person.
Loc.gov is Library of Congress, registered through get.gov and first seen Oct 1, 1997.
The Library of Congress (loc.gov) is the research library of the United States Congress and the de facto national library of the United States, located in Washington, D.C. It is the oldest federal cultural institution in the U.S. and holds millions of books, recordings, photographs, maps, and manuscripts.
The Library of Congress implements DMARC enforcement per CISA BOD 18-01 with SPF, DKIM, and DMARC authentication on its email communications.
The loc.gov mail servers do not function as catch-all. Recipients are validated and invalid addresses rejected. Government-standard security filtering applies.
Email delivery to loc.gov requires full authentication compliance with SPF, DKIM, and DMARC.
Upload a CSV or TXT list of Loc.gov addresses to the bulk email verifier. Every address runs through a live SMTP handshake plus catch-all, role-account and disposable detection, and you download a clean list when processing completes. For real-time checks at signup, use the real-time email verification API.
CSV or TXT with one email per line. No formatting needed.
Each Loc.gov address is checked with a live server handshake.
Get a verified list with status codes, risk flags, and catch-all detection.
Pay as you go. No subscriptions, and credits never expire.
Everything about verifying email at this domain.
Yes, loc.gov is a valid official government email domain operated by Library of Congress. It is used by government employees and officials for official correspondence.
No, loc.gov is not a disposable or temporary email provider. It is an official government domain used for legitimate government communications and operations.
loc.gov uses mail servers managed by Library of Congress. Check the MX records section above for specific server details and authentication configuration.
Yes, loc.gov addresses accept incoming email. Government mail servers typically enforce strict spam filtering, authentication checks (SPF, DKIM, DMARC), and content scanning. Ensure your sending domain is properly authenticated.
Use BulkEmailChecker to verify loc.gov addresses. Government domains may have specific SMTP behaviors including greylisting and strict rate limiting. Our tool handles these provider-specific configurations automatically.
Upload a CSV or TXT list to the bulk email verifier. Every address runs through 30+ checks including SMTP existence, catch-all detection, role-account, and disposable matching. Processing time depends on list size.
99.7% accurate using a direct SMTP handshake with loc.gov's mail servers, the same engine that has verified billions of addresses since 2012.
Other government email domains we have audited.