loc.gov - Email Domain Verification & Deliverability Report

Active Government Email
Organization: Library of Congress
Mail Server: Proofpoint
Verified 5 days ago

Verify email addresses @loc.gov. View MX records, mail server configuration, and authentication status for Library of Congress.

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MX Records for loc.gov

PriorityMail ServerIP Address
10 mxb-00026101.gslb.gpphosted.com 66.159.228.43
10 mxa-00026101.gslb.gpphosted.com 66.159.228.43
SMTP Status: Responding
SMTP Banner:
220 mx0f-00026101.gpphosted.com ESMTP mfa-m0478990

loc.gov uses Proofpoint mail servers, which means emails are processed through Proofpoint infrastructure with their built-in spam filtering and security controls.

Email Authentication for loc.gov

SPF Record Pass

v=spf1 include:spf1.loc.gov include:spf2.loc.gov include:spf-00026101.gpphosted.com mx -all
Authorized Senders:
spf1.loc.gov spf2.loc.gov spf-00026101.gpphosted.com

SPF (Sender Policy Framework) specifies which mail servers are authorized to send email on behalf of loc.gov.

DMARC Record None

v=DMARC1;p=none;sp=none;fo=1;rua=mailto:locdmarc_reports@loc.gov;ruf=mailto:locdmarc_ruf@loc.gov;rf=afrf;pct=100

Policy applied to: 100% of emails

DMARC (Domain-based Message Authentication) tells receiving servers what to do with emails that fail authentication checks.

DKIM Not Detected

DKIM detection is limited from external scanning. The domain may use DKIM with selectors not covered by our scan.

Authentication Summary: loc.gov has SPF and DMARC configured. This provides good protection against email spoofing. Senders can expect reliable email delivery to this domain.

WHOIS & Domain Information

Registration Details

Domain
loc.gov
TLD
.gov
Created
1997-10-01
Updated
2025-07-12
Expires
2026-07-07
Domain Age
28 years

Registrar

Name
get.gov
IANA ID
93

Registrant Contact

Name
REDACTED FOR PRIVACY
Organization
REDACTED FOR PRIVACY
Location
REDACTED FOR PRIVACY, REDACTED FOR PRIVACY, UNITED STATES

Technical Contact

Name
REDACTED FOR PRIVACY
Organization
REDACTED FOR PRIVACY
Location
REDACTED FOR PRIVACY, REDACTED FOR PRIVACY, UNITED STATES

Name Servers

  • alice.ns.cloudflare.com
  • kevin.ns.cloudflare.com

Email Verification for loc.gov Government Addresses

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.

How to Verify loc.gov Email Addresses

Need to check if an email address at loc.gov actually exists before you send to it? BulkEmailChecker performs deep SMTP-level validation, connecting directly to loc.gov's mail servers to confirm the mailbox is real, active, and able to receive your message. No test email is ever sent, so your sender reputation stays protected.

Verify a Single loc.gov Email
Use BulkEmailChecker's free email verification tool to instantly validate any loc.gov address. You'll get a complete deliverability report including mailbox existence, catch-all detection, disposable domain flagging, and risk scoring, all in under 3 seconds.

Verify a List of loc.gov Emails in Bulk
Have a mailing list full of loc.gov addresses? Upload your CSV or TXT file to BulkEmailChecker and verify thousands of email addresses in minutes. Our bulk verification engine runs 30+ checks per address including syntax validation, DNS resolution, SMTP handshake, and spam trap detection. Clean your list before every campaign to keep bounce rates below 2% and protect your sender score. See bulk pricing.

Verify loc.gov Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates loc.gov email addresses at the point of entry, blocking invalid, disposable, and risky addresses before they enter your database. Integrate with a single API call and prevent bad data at the source.

Frequently Asked Questions

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.
The fastest and most accurate way to verify a loc.gov email address is to use BulkEmailChecker's free email verification tool. Simply enter the full email address and our system performs SMTP-level validation by connecting directly to loc.gov's mail servers. You'll get instant results showing whether the mailbox exists, is deliverable, and is safe to send to, all without sending a single email.
Yes. BulkEmailChecker uses SMTP verification to check if a loc.gov mailbox exists without ever delivering an email. Our system connects to the domain's mail server, performs an SMTP handshake, and queries the mail server to confirm whether the recipient address is valid. This process is completely invisible to the email recipient and does not affect your sender reputation.
Sending to invalid email addresses causes hard bounces, which directly damage your sender reputation. Internet Service Providers (ISPs) and email providers track your bounce rate, and if it exceeds 2%, your emails may start landing in spam folders or get blocked entirely. Verifying loc.gov addresses with BulkEmailChecker before sending prevents bounces and keeps your deliverability high.
BulkEmailChecker's bulk verification service lets you upload a CSV or TXT file containing thousands of loc.gov email addresses and verify them all at once. Each address goes through 30+ verification checks including syntax validation, DNS/MX lookup, SMTP verification, disposable domain detection, and spam trap identification. Results are typically ready within minutes and can be downloaded as a clean, verified list.
Email verification is the process of confirming that an email address is real, properly formatted, and capable of receiving messages. It matters because sending to invalid addresses causes bounces, damages your sender reputation, wastes marketing budget, and can get your sending IP blacklisted. BulkEmailChecker verifies addresses at the SMTP level, the most accurate method available, ensuring your emails reach real people.
MX (Mail Exchange) records are DNS entries that specify which mail servers are responsible for receiving email for a domain. When you send an email, your mail server looks up the recipient domain's MX records to find where to deliver the message. If a domain has no MX records, it cannot receive email. BulkEmailChecker checks MX records as part of every verification to confirm the domain is configured for email delivery.
A catch-all (or accept-all) domain is configured to accept email sent to any address at that domain, regardless of whether the specific mailbox exists. This makes it harder to verify individual addresses because the server always responds positively. BulkEmailChecker detects catch-all configurations and flags them in verification results so you can make informed decisions about sending to those addresses.
Yes. BulkEmailChecker offers a real-time email verification API that you can integrate into signup forms, CRM systems, lead capture tools, and any application that collects email addresses. The API validates addresses at the point of entry, blocking invalid, disposable, and risky emails before they enter your database. Integration takes just a single API call with response times under 3 seconds.

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