Domain Intelligence
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Github.com

Safe to Send

Github.com is operated by Microsoft Corporation. The domain runs 1 mail exchange and SMTP is responsive, with all three authentication standards in force.

Safe to Send
Verify Mailbox

Verify @github.com emails

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

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

Trusted by 400,000+ senders

4.9/5
From 8,500+ verified reviews
The risk score saves my team probably an hour a day in manual prospect research. We sort outreach lists by it and skip anything in the high-risk band. Bounce rate is the lowest it's ever been. Lisa Fonseca · SDR Team Lead
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
1
Mail exchangers

Mail Exchange (MX) Records for github.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.

1 RECORD
#0
github-com.mail.protection.outlook.com 52.101.41.56
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 CO1PEPF00012E63.mail.protection.outlook.com Microsoft ESMTP MAIL Service ready at Sat, 16 May 2026 05:10:20 +0000 [08DEB0ADC8054281]
Primary mail server accepted SMTP connection and returned a banner during the live audit.

github.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 ip4:192.30.252.0/22 include:spf.protection.outlook.com include:_netblocks.google.com include:_netblocks2.google.com include:mail.zendesk.com include:_spf.salesforce.com include:servers.mcsv.net include:mktomail.com include:sendgrid.net ip4:62.253.227.114 ip4:166.78.69.169 ip4:166.78.69.170 ip4:166.78.71.131 ~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. Quarantine
TXTv=DMARC1; p=quarantine; sp=reject; pct=100; rua=mailto:dmarc@github.com; ruf=mailto:dmarc@github.com; fo=1
Receivers are instructed to quarantine (route to spam) any mail that fails SPF or DKIM.

github.com Domain Registration WHOIS · Nameservers · Registrar

18 YEARS OLD
RegistrarMarkMonitor, Inc.
IANA ID292
RegisteredOctober 9, 2007
Last UpdatedSeptember 7, 2024
ExpiresOctober 8, 2026
Age18 years
TLD.com
Authoritative Nameservers (8)
  • dns4.p08.nsone.net
  • dns2.p08.nsone.net
  • dns3.p08.nsone.net
  • ns-421.awsdns-52.com
  • ns-520.awsdns-01.net
  • ns-1707.awsdns-21.co.uk
  • dns1.p08.nsone.net
  • ns-1283.awsdns-32.org
Registrant
GitHub, Inc.
UNITED STATES
Technical Contact
Hidden by registrar privacy service
About this Domain

About github.com

GitHub (github.com) is the world's largest software development and version control platform, owned by Microsoft Corporation and headquartered in San Francisco, California. GitHub hosts over 200 million code repositories and serves over 100 million developers worldwide. The platform is essential infrastructure for open-source software development and enterprise code collaboration.

The github.com domain implements enterprise email authentication with SPF, DKIM, and DMARC enforcement. GitHub is frequently targeted by phishing attacks that impersonate repository notifications, pull request alerts, and security vulnerability warnings. Strong authentication protects the developer community from these sophisticated social engineering attempts.

Email verification against github.com provides definitive accept/reject responses for individual mailboxes. The domain does not function as catch-all. GitHub's mail infrastructure benefits from Microsoft's enterprise security stack and implements strict rate limiting on inbound SMTP connections.

Delivering to github.com requires proper sender authentication. GitHub's email filtering leverages Microsoft's security infrastructure to evaluate incoming messages for authentication compliance, sender reputation, and content quality. Maintaining valid SPF, DKIM, and DMARC records is essential for reliable inbox delivery to github.com employees.

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Common Questions About github.com

Is github.com a disposable or temporary email provider?
No. github.com is not a disposable email provider. It is classified as Corporate Email operated by Microsoft Corporation and addresses on github.com are persistent rather than throwaway. Mail sent to a valid github.com mailbox reaches a real recipient.
How do I verify if a github.com email address is valid?
The fastest way to verify a github.com email address is to use our free email checker. Enter any @github.com mailbox at the top of this page and our system performs a real-time SMTP handshake against github.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 github.com email exists without sending a message?
Yes. Our real-time email verification API connects directly to github.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 github.com mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for github.com?
github.com currently publishes 1 mail exchange (MX) record. The primary MX is github-com.mail.protection.outlook.com, which is the first server contacted when other mail systems try to deliver email to a github.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 github.com.
Does github.com use SPF, DKIM, and DMARC email authentication?
github.com enforces all three email authentication standards: SPF, DKIM, and DMARC (policy: quarantine). This is the gold-standard configuration. It means receivers can verify that mail claiming to come from @github.com is genuine, and github.com's DMARC policy of 'quarantine' instructs receivers how to handle messages that fail those checks.
Why do emails to github.com bounce or get blocked?
Bounces from github.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 github.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 github.com's receivers trust you.
How can I verify a large list of github.com email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of github.com addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, github.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 github.com email addresses?
Yes, with normal hygiene. github.com is a legitimate email service and signups from @github.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 github.com by default.
What email format does github.com use for usernames?
Most github.com mailboxes follow common patterns like first.last@github.com, firstinitiallast@github.com, or first@github.com, but the actual local-part rules depend on Microsoft Corporation. The only reliable way to confirm whether a specific @github.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 github.com risk score calculated?
The 0-to-100 risk score for github.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 github.com score is recomputed on every audit so it always reflects the live state of the domain.
Is github.com a valid email domain?
Yes, github.com is the official corporate email domain for Microsoft Corporation. It is used for business communications and is not available for public registration.
Is github.com a disposable or temporary email provider?
No, github.com is a corporate email domain belonging to Microsoft Corporation, used exclusively by employees and authorized personnel.
What mail server does github.com use?
github.com uses enterprise-grade mail infrastructure. Check the MX records section above for specific mail server details.
Can I send marketing emails to github.com addresses?
B2B marketing to github.com addresses requires proper consent and compliance with anti-spam laws. Corporate domains may use catch-all configurations, so verify addresses before sending.
How do I verify an email address at github.com?
Corporate domains like github.com may use catch-all configurations. Use BulkEmailChecker advanced verification to detect catch-all behavior and validate individual addresses.