Domain Intelligence
Last Updated:

United.com

Safe to Send

United.com is operated by United Airlines. 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 @united.com emails

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

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

Trusted by 400,000+ senders

4.9/5
From 8,500+ verified reviews
Reached out to support during our API integration last month. Response in under 15 minutes, the rep was so sharp and helpful that by the end of the thread it honestly felt like I was flirting with him. Amazing support team. A+++. Nathan Orozco · Lead Engineer · via X
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 united.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
mxa-00212602.gslb.pphosted.com 67.231.145.22
Reachable
#10
mxb-00212602.gslb.pphosted.com 67.231.152.135
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-00212602.pphosted.com ESMTP mfa-m0343558
Primary mail server accepted SMTP connection and returned a banner during the live audit.

united.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.

united.com Domain Registration WHOIS · Nameservers · Registrar

27 YEARS OLD
RegistrarCSC Corporate Domains, Inc.
IANA ID299
RegisteredDecember 16, 1998
Last UpdatedApril 20, 2026
ExpiresDecember 16, 2026
Age27 years
TLD.com
Authoritative Nameservers (6)
  • a26-64.akam.net
  • a10-65.akam.net
  • a11-66.akam.net
  • a18-67.akam.net
  • a5-65.akam.net
  • a1-66.akam.net
Registrant
United Airlines, Inc.
IL, UNITED STATES
About this Domain

About united.com

United Airlines (united.com) is one of the largest airlines in the world, headquartered in Chicago, Illinois. United operates a comprehensive domestic and international route network with major hubs at Chicago O'Hare, Newark, Denver, Houston, San Francisco, and Washington Dulles. The airline is a founding member of the Star Alliance, the world's largest airline alliance.

United implements enterprise email authentication on the united.com domain with SPF, DKIM, and DMARC enforcement. Airlines face constant phishing threats from campaigns impersonating booking confirmations, MileagePlus loyalty notifications, and flight change alerts. Strong authentication prevents unauthorized use of the united.com domain.

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

For travel industry partners communicating with United Airlines employees, proper sender authentication improves deliverability. United's corporate email filters enforce SPF, DKIM, and DMARC validation on incoming messages. Full authentication compliance ensures reliable delivery to united.com addresses.

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Common Questions About united.com

Is united.com a disposable or temporary email provider?
No. united.com is not a disposable email provider. It is classified as Corporate Email operated by United Airlines and addresses on united.com are persistent rather than throwaway. Mail sent to a valid united.com mailbox reaches a real recipient.
How do I verify if a united.com email address is valid?
The fastest way to verify a united.com email address is to use our free email checker. Enter any @united.com mailbox at the top of this page and our system performs a real-time SMTP handshake against united.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 united.com email exists without sending a message?
Yes. Our real-time email verification API connects directly to united.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 united.com mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for united.com?
united.com currently publishes 2 mail exchange (MX) records. The primary MX is mxa-00212602.gslb.pphosted.com, which is the first server contacted when other mail systems try to deliver email to a united.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 united.com.
Does united.com use SPF, DKIM, and DMARC email authentication?
united.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 @united.com is genuine, and united.com's DMARC policy of 'reject' instructs receivers how to handle messages that fail those checks.
Why do emails to united.com bounce or get blocked?
Bounces from united.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 united.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 united.com's receivers trust you.
How can I verify a large list of united.com email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of united.com addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, united.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 united.com email addresses?
Yes, with normal hygiene. united.com is a legitimate email service and signups from @united.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 united.com by default.
What email format does united.com use for usernames?
Most united.com mailboxes follow common patterns like first.last@united.com, firstinitiallast@united.com, or first@united.com, but the actual local-part rules depend on United Airlines. The only reliable way to confirm whether a specific @united.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 united.com risk score calculated?
The 0-to-100 risk score for united.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 united.com score is recomputed on every audit so it always reflects the live state of the domain.
Is united.com a valid corporate email domain?
Yes, united.com is the official corporate email domain for United Airlines. It is used for internal business communications and is not available for public registration.
Is united.com a disposable or temporary email provider?
No, united.com is a corporate email domain belonging to United Airlines, used exclusively by employees and authorized personnel.
What mail server does united.com use?
united.com uses enterprise-grade mail infrastructure. Check the MX records section above for specific mail server details.
Can I send marketing emails to united.com addresses?
B2B marketing to united.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 united.com?
Corporate domains like united.com may use catch-all configurations. Use BulkEmailChecker's advanced verification to detect catch-all behavior.