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Regeneron.com

Safe to Send

Regeneron.com is operated by Regeneron Pharmaceuticals. The domain runs 2 mail exchanges and SMTP is responsive, with all three authentication standards in force.

Safe to Send
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Verify @regeneron.com emails

Live SMTP handshake against regeneron.com mail servers. No email is sent. 10 free per day, no signup.

@regeneron.com
No email sent No signup Real-time SMTP

Trusted by 400,000+ senders

4.9/5
From 8,500+ verified reviews
Compliance approved this in two weeks thanks to SOC 2 Type II and the GDPR documentation. Verification accuracy holds at the advertised 99%+ across our 80k physician contact list. Dana Mehta · IT Director, Healthcare
SOC 2 Type II GDPR CCPA 99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
Yes
Mail server responds to SMTP handshake
MX Records
2
Mail exchangers

Mail Exchange (MX) Records for regeneron.com Mail Exchange records. They tell other mail servers which hosts are responsible for receiving email at this domain, in priority order. Lower priority numbers are tried first.

2 RECORDS
#10
mxb-002cca01.gslb.pphosted.com 148.163.150.247
Reachable
#10
mxa-002cca01.gslb.pphosted.com 148.163.150.247
Reachable
SMTP Handshake Simple Mail Transfer Protocol. We open a live SMTP connection to the primary MX and read the greeting banner. A response confirms the mail server is alive and accepting connections. Responsive
BANNER220 mx0a-002cca01.pphosted.com ESMTP mfa-m0148626
Primary mail server accepted SMTP connection and returned a banner during the live audit.

regeneron.com Email Authentication SPF · DKIM · DMARC

3/3 PASS
SPF Sender Policy Framework. A DNS record listing which servers are allowed to send mail for this domain. Receivers reject or flag mail from unauthorized servers. Pass
TXTv=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com -all
Authorized senders are defined and pass SPF policy.
DKIM DomainKeys Identified Mail. The sending server cryptographically signs outbound mail with a private key, and receivers verify the signature using a public key in DNS. Pass
SELECTORDetected via standard selectors
A DKIM signature was detected. Outbound mail from this domain can be cryptographically verified.
DMARC Domain-based Message Authentication, Reporting & Conformance. Tells receivers what to do when SPF or DKIM checks fail: none, quarantine, or reject. Reject
TXTv=DMARC1; p=reject; fo=1; pct=100; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com
Strict policy. Receivers are instructed to reject any mail that fails SPF or DKIM. The strongest available setting.

regeneron.com Domain Registration WHOIS · Nameservers · Registrar

28 YEARS OLD
RegistrarMarkMonitor, Inc.
IANA ID292
RegisteredJuly 10, 1997
Last UpdatedNovember 21, 2025
ExpiresJuly 9, 2030
Age28 years
TLD.com
Authoritative Nameservers (7)
  • ns2.markmonitor.com
  • ns6.markmonitor.com
  • ns4.markmonitor.com
  • ns1.markmonitor.com
  • ns3.markmonitor.com
  • ns5.markmonitor.com
  • ns7.markmonitor.com
Registrant
Regeneron Pharmaceuticals Inc
UNITED STATES
Technical Contact
Hidden by registrar privacy service
About this Domain

About regeneron.com

Regeneron Pharmaceuticals (regeneron.com) is a biotechnology company headquartered in Tarrytown, New York. Regeneron discovers, develops, and commercializes medicines for serious medical conditions including eye diseases, allergic and inflammatory conditions, cancer, cardiovascular diseases, and infectious diseases. The company is known for its VEGF Trap-Eye technology and monoclonal antibody therapies.

Regeneron implements enterprise email authentication on the regeneron.com domain with SPF, DKIM, and DMARC enforcement. As a biotechnology company handling proprietary drug development data and clinical research, Regeneron maintains strict email security to protect its cutting-edge therapeutic research and regulatory communications.

Email verification against regeneron.com provides definitive accept/reject responses for individual mailboxes. The domain does not operate as catch-all. Regeneron's enterprise mail infrastructure implements rate limiting on inbound SMTP connections.

For healthcare partners communicating with Regeneron employees, proper sender authentication is important. Biotech companies enforce strict email filtering for data protection and regulatory compliance. Full SPF, DKIM, and DMARC compliance ensures reliable delivery to regeneron.com addresses.

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Common Questions About regeneron.com

Is regeneron.com a disposable or temporary email provider?
No. regeneron.com is not a disposable email provider. It is classified as Corporate Email operated by Regeneron Pharmaceuticals and addresses on regeneron.com are persistent rather than throwaway. Mail sent to a valid regeneron.com mailbox reaches a real recipient.
How do I verify if a regeneron.com email address is valid?
The fastest way to verify a regeneron.com email address is to use our free email checker. Enter any @regeneron.com mailbox at the top of this page and our system performs a real-time SMTP handshake against regeneron.com's mail servers, confirming whether the mailbox exists, is reachable, and is safe to send to. No email is ever delivered during the check.
Can I check if a regeneron.com email exists without sending a message?
Yes. Our real-time email verification API connects directly to regeneron.com's mail server, opens an SMTP session, and queries the mailbox using the RCPT TO command without ever transmitting an actual email. The server's response confirms whether the regeneron.com mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for regeneron.com?
regeneron.com currently publishes 2 mail exchange (MX) records. The primary MX is mxb-002cca01.gslb.pphosted.com, which is the first server contacted when other mail systems try to deliver email to a regeneron.com address. The full list with priorities and IP addresses is in the MX Records panel above. MX records tell sending servers where to route email for regeneron.com.
Does regeneron.com use SPF, DKIM, and DMARC email authentication?
regeneron.com enforces all three email authentication standards: SPF, DKIM, and DMARC (policy: reject). This is the gold-standard configuration. It means receivers can verify that mail claiming to come from @regeneron.com is genuine, and regeneron.com's DMARC policy of 'reject' instructs receivers how to handle messages that fail those checks.
Why do emails to regeneron.com bounce or get blocked?
Bounces from regeneron.com usually fall into three buckets: the mailbox doesn't exist (5xx user unknown), the inbox is full, or your sending domain isn't authenticated to regeneron.com's satisfaction. The fastest fix is to run each address through a free email verifier before you send, and to make sure your own SPF, DKIM, and DMARC are configured correctly so regeneron.com's receivers trust you.
How can I verify a large list of regeneron.com email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of regeneron.com addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, regeneron.com catch-all detection, role-account detection, and disposable-domain matching. Results typically come back within minutes and previously-failed addresses on your blacklist are reprocessed for free. For continuous high-volume needs, see our unlimited email verification API.
Is it safe to accept signups from regeneron.com email addresses?
Yes, with normal hygiene. regeneron.com is a legitimate email service and signups from @regeneron.com behave like any other real user. Pipe each address through a real-time email verifier API at the moment of signup to catch typos and dead mailboxes, but there is no need to block regeneron.com by default.
What email format does regeneron.com use for usernames?
Most regeneron.com mailboxes follow common patterns like first.last@regeneron.com, firstinitiallast@regeneron.com, or first@regeneron.com, but the actual local-part rules depend on Regeneron Pharmaceuticals. The only reliable way to confirm whether a specific @regeneron.com address exists is to run it through a free email verification tool. Guessing patterns will produce a high bounce rate and damage your sender reputation.
How is the regeneron.com risk score calculated?
The 0-to-100 risk score for regeneron.com combines disposable-domain classification, mail-server reachability, MX record presence and depth, SPF / DKIM / DMARC enforcement, DMARC policy strength, SMTP banner response, and domain age. Lower scores mean safer to send to. Disposable domains are pinned at the high end of the scale. The regeneron.com score is recomputed on every audit so it always reflects the live state of the domain.
Is regeneron.com a valid email domain?
Yes, regeneron.com is the official corporate email domain for Regeneron Pharmaceuticals. It is used for internal business communications.
Is regeneron.com a disposable or temporary email provider?
No, regeneron.com is a corporate email domain belonging to Regeneron Pharmaceuticals, used exclusively by employees and authorized personnel.
What mail server does regeneron.com use?
regeneron.com uses enterprise-grade mail infrastructure. Check the MX records section for specific mail server details.
Can I send marketing emails to regeneron.com addresses?
B2B marketing to regeneron.com requires proper consent. Corporate domains may use catch-all configurations, so verify individual addresses before sending.
How do I verify an email address at regeneron.com?
Corporate domains like regeneron.com may use catch-all configurations that accept all addresses. Use BulkEmailChecker advanced verification to detect catch-all behavior and validate individual mailboxes.