Domain Intelligence
Last Updated:
Canonical Email Verification
Safe to Send
Canonical.com is operated by Canonical Ltd.. The domain runs 1 mail exchange and SMTP is responsive, with 2 of 3 authentication standards in place.
Safe to Send
RISK
22
/100
Low
Verify Mailbox
Verify @canonical.com emails
Live SMTP handshake against canonical.com mail servers. No email is sent. 10 free per day, no signup.
Trusted by 400,000+ senders
4.9/5
From 8,500+ verified reviews
We had a sender reputation crisis after a list import went badly. Used the bulk verifier to scrub everything, then plugged the API into our signup form. Took deliverability from 73% to 96% over six weeks. Sarah Knowles · Email Marketing 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 canonical.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.
#10
mx.canonical.com 185.125.188.68
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 smtp-mx-canonical-1.canonical.com ESMTP Postfix (Ubuntu)
Primary mail server accepted SMTP connection and returned a banner during the live audit.
canonical.com Email Authentication SPF · DKIM · DMARC
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:_spf.canonical.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.
Missing
No DKIM signature detected on common selectors for canonical.com.
No DKIM signature was detected. Receivers cannot verify the integrity of outbound mail.
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; pct=100; rua=mailto:dmarc-rua@admin.canonical.com
Strict policy. Receivers are instructed to reject any mail that fails SPF or DKIM. The strongest available setting.
canonical.com Domain Registration WHOIS · Nameservers · Registrar
RegistrarMarkMonitor, Inc.
IANA ID292
RegisteredJuly 5, 1996
Last UpdatedJanuary 7, 2026
ExpiresJuly 3, 2027
Age29 years
TLD.com
Authoritative Nameservers (3)
- ns1.canonical.com
- ns3.canonical.com
- ns2.canonical.com
Registrant
Canonical, Ltd.
UNITED KINGDOM
Technical Contact
Hidden by registrar privacy service
About this Domain
About canonical.com
Canonical Ltd. (canonical.com) is a UK-based technology company headquartered in London, England. Canonical is the publisher of Ubuntu, one of the most popular Linux distributions in the world. The company provides enterprise support, cloud infrastructure, and IoT solutions built on Ubuntu, serving millions of developers and organizations globally.
Canonical implements email authentication on the canonical.com domain with SPF, DKIM, and DMARC enforcement. As the company behind Ubuntu Linux, Canonical maintains strong email security to protect open-source project communications, enterprise customer support, and community interactions.
SMTP verification of canonical.com addresses returns definitive responses for valid and invalid mailboxes. The domain does not function as catch-all. Canonical's mail infrastructure implements rate limiting on inbound SMTP connections.
For partners communicating with Canonical employees, proper sender authentication improves deliverability. Canonical's corporate email filters enforce SPF, DKIM, and DMARC validation. Authentication compliance ensures reliable inbox delivery to canonical.com addresses.
Other Domains Similar to canonical.com
Other corporate email domains we've audited. Click any one to see its MX records, authentication, and risk score.
evgo.com
EVgo
medtronic.com
Medtronic plc
philips.com
Royal Philips
nokia.com
Nokia Corporation
nyse.com
New York Stock Exchange
penske.com
Penske Automotive Group
sap.com
SAP SE
cmegroup.com
CME Group Inc.
geico.com
GEICO
infineon.com
Infineon Technologies
meta.com
Meta Platforms Inc.
mitsui.com
Mitsui and Co
dollargeneral.com
Dollar General Corporation
kirin.com
Kirin Holdings
espn.com
ESPN/Disney
nio.com
NIO Inc
valve.com
Valve Corporation
implats.com
Impala Platinum Holdings
mandt.com
M&T Bank Corporation
beamtx.com
Beam Therapeutics
More Email Verification Tools
Free single-address checks, bulk uploads, and APIs for plugging email verification into your own product.
Common Questions About canonical.com
Is canonical.com a disposable or temporary email provider?
No. canonical.com is not a disposable email provider. It is classified as Corporate Email operated by Canonical Ltd. and addresses on canonical.com are persistent rather than throwaway. Mail sent to a valid canonical.com mailbox reaches a real recipient.
How do I verify if a canonical.com email address is valid?
The fastest way to verify a canonical.com email address is to use our email checker. Enter any @canonical.com mailbox at the top of this page and our system performs a real-time SMTP handshake against canonical.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 canonical.com email exists without sending a message?
Yes. Our real-time email verification API connects directly to canonical.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 canonical.com mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for canonical.com?
canonical.com currently publishes 1 mail exchange (MX) record. The primary MX is mx.canonical.com, which is the first server contacted when other mail systems try to deliver email to a canonical.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 canonical.com.
Does canonical.com use SPF, DKIM, and DMARC email authentication?
canonical.com has 2 of the 3 standard email authentication records in place: SPF, and DMARC (policy: reject). Adding the missing layer(s) would tighten anti-spoofing protection and improve deliverability for legitimate canonical.com mail.
Why do emails to canonical.com bounce or get blocked?
Bounces from canonical.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 canonical.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 canonical.com's receivers trust you.
How can I verify a large list of canonical.com email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of canonical.com addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, canonical.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 canonical.com email addresses?
Yes, with normal hygiene. canonical.com is a legitimate email service and signups from @canonical.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 canonical.com by default.
What email format does canonical.com use for usernames?
Most canonical.com mailboxes follow common patterns like first.last@canonical.com, firstinitiallast@canonical.com, or first@canonical.com, but the actual local-part rules depend on Canonical Ltd.. The only reliable way to confirm whether a specific @canonical.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 canonical.com risk score calculated?
The 0-to-100 risk score for canonical.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 canonical.com score is recomputed on every audit so it always reflects the live state of the domain.
Is canonical.com a valid corporate email domain?
Yes, canonical.com is the official corporate email domain for Canonical Ltd.. It is used for internal business communications and is not available for public registration.
Is canonical.com a disposable or temporary email provider?
No, canonical.com is a corporate email domain belonging to Canonical Ltd., used exclusively by employees and authorized personnel.
What mail server does canonical.com use?
canonical.com uses enterprise-grade mail infrastructure. Check the MX records section above for specific mail server details.
Can I send marketing emails to canonical.com addresses?
B2B marketing to canonical.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 canonical.com?
Corporate domains like canonical.com may use catch-all configurations. Use BulkEmailChecker's advanced verification to detect catch-all behavior.