nih.gov - Email Domain Verification & Deliverability Report

Active Government Email
Organization: National Institutes of Health
Mail Server: nih.gov
Verified 1 days ago

Verify email addresses @nih.gov. View MX records, mail server configuration, and authentication status for National Institutes of Health.

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MX Records for nih.gov

PriorityMail ServerIP Address
10 nihcesxway4.hub.nih.gov 128.231.90.119
10 nihcesxwayst04.hub.nih.gov 165.112.13.42
10 nihcesxwayst05.hub.nih.gov 165.112.13.46
10 nihcesxwayst03.hub.nih.gov 165.112.13.34
10 nihcesxway6.hub.nih.gov 128.231.90.121
10 nihcesxwayst06.hub.nih.gov 165.112.13.54
10 nihcesxway3.hub.nih.gov 128.231.90.125
10 nihcesxway5.hub.nih.gov 128.231.90.120
SMTP Status: Responding
SMTP Banner:
220 nihcesxway4.hub.nih.gov ESMTP

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

Email Authentication for nih.gov

SPF Record Pass

v=spf1 ip4:128.231.90.64/26 ip4:165.112.13.0/26 ip4:156.40.79.128/25 ip4:128.231.89.192/28 ip4:165.112.69.16/28 ip4:165.112.194.0/25 ip6:2607:f220:0404:8104::0/64 ip6:2607:f220:402:1a01::0/64 ip6:2607:f220:404:12e::/64 ip6:2607:f220:402:12e::/64 include:spf.protection.outlook.com ~all
Authorized Senders:
spf.protection.outlook.com

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

DMARC Record Reject

v=DMARC1; p=reject; rua=mailto:8idhoybh@ag.us.dmarcian.com,mailto:reports@dmarc.cyber.dhs.gov; ruf=mailto:8idhoybh@fr.us.dmarcian.com; fo=1;

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

DKIM Found

DKIM signatures were detected for nih.gov, confirming that this domain cryptographically signs outgoing emails.

Authentication Summary: nih.gov has full email authentication configured with SPF, DMARC, and DKIM. This provides strong protection against email spoofing and phishing. Emails sent from this domain are well-authenticated and likely to have high deliverability.

WHOIS & Domain Information

Registration Details

Domain
nih.gov
TLD
.gov
Created
1997-10-01
Updated
2025-08-27
Expires
2026-08-22
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

  • ns.nih.gov
  • ns2.nih.gov
  • ns3.nih.gov

Email Verification for nih.gov Government Addresses

The National Institutes of Health (nih.gov) is the primary U.S. federal agency for biomedical and public health research. Part of HHS, NIH comprises 27 institutes and centers, funds medical research worldwide, and conducts groundbreaking studies at its campus in Bethesda, Maryland.

NIH implements mandatory DMARC enforcement per CISA BOD 18-01 with SPF, DKIM, and DMARC. As a leading health research institution, NIH faces phishing targeting researchers and grant applicants. Email security protects sensitive research communications.

The nih.gov mail servers do not function as catch-all. Recipients are validated and invalid addresses rejected. NIH applies strict security filtering.

Email delivery to nih.gov requires full authentication compliance. NIH gateways apply rigorous filtering given the sensitivity of health research communications.

How to Verify nih.gov Email Addresses

Need to check if an email address at nih.gov actually exists before you send to it? BulkEmailChecker performs deep SMTP-level validation, connecting directly to nih.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 nih.gov Email
Use BulkEmailChecker's free email verification tool to instantly validate any nih.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 nih.gov Emails in Bulk
Have a mailing list full of nih.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 nih.gov Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates nih.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, nih.gov is an official government email domain used by National Institutes of Health. Government domains are verified and regulated, making them highly trustworthy.
No, nih.gov is an official government domain used by National Institutes of Health for official government communications.
nih.gov uses government-managed mail infrastructure with strict security measures and email authentication.
Sending unsolicited marketing emails to government addresses at nih.gov is generally not recommended. Only send with explicit opt-in consent.
Government domains like nih.gov often have strict mail server configurations. Use BulkEmailChecker for reliable verification results.
The fastest and most accurate way to verify a nih.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 nih.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 nih.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 nih.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 nih.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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