Domain Intelligence
Last Updated:
Zen.co.uk
Safe to Send
Zen.co.uk is operated by Zen Internet. The domain runs 1 mail exchange and SMTP is not currently responding, with all three authentication standards in force.
Safe to Send
RISK
23
/100
Low
Verify Mailbox
Verify @zen.co.uk emails
Live SMTP handshake against zen.co.uk 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
Ran our entire 47k cold outbound list through this before our Q1 push. Bounce rate dropped from 9.4% to 0.8%. The SMTP-level catch on outdated B2B contacts is what set this apart from the other verifiers I tried. Andrew Mitchell · Sr. Demand Gen Manager
SOC 2 Type II
GDPR
CCPA
99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
No
Mail server not responding to SMTP
MX Records
1
Mail exchangers
Mail Exchange (MX) Records for zen.co.uk 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
mailcluster.zen.co.uk 212.23.6.67
No Response
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.
No Response
Primary mail server did not respond to SMTP within the audit timeout. Mail to zen.co.uk may bounce.
zen.co.uk 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.zen.co.uk include:_spfcoremail.zen.co.uk include:_spf.salesforce.com include:_spfmarketing.zen.co.uk include:servers.mcsv.net include:amazonses.com include:spf.protection.outlook.com a:smtp.insmartcloud.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.
Quarantine
TXTv=DMARC1; p=quarantine; aspf=r; adkim=r; ruf=mailto:abuse@zen.co.uk; fo=1
Receivers are instructed to quarantine (route to spam) any mail that fails SPF or DKIM.
zen.co.uk Domain Registration WHOIS · Nameservers · Registrar
RegistrarZen Internet Limited [Tag = ZENSYS]
IANA ID4151
Last UpdatedApril 1, 2026
ExpiresSeptember 30, 2031
Age29 years
TLD.co.uk
Authoritative Nameservers (4)
- ns0.zen.co.uk
- ns1.zen.co.uk
- v6.ns0.zen.co.uk
- v6.ns1.zen.co.uk
About this Domain
About zen.co.uk
zen.co.uk is a UK ISP domain from Zen Internet, an award-winning broadband provider based in Rochdale, England. Zen is known for excellent customer service and business-grade broadband.
zen.co.uk implements SPF and DKIM authentication. Compliant with UK GDPR.
The mail servers validate recipients and reject invalid addresses. The domain does not operate as catch-all.
For delivery, authenticate with SPF and DKIM. Follow UK email regulations.
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Common Questions About zen.co.uk
Is zen.co.uk a disposable or temporary email provider?
No. zen.co.uk is not a disposable email provider. It is classified as ISP Email Provider operated by Zen Internet and addresses on zen.co.uk are persistent rather than throwaway. Mail sent to a valid zen.co.uk mailbox reaches a real recipient.
How do I verify if a zen.co.uk email address is valid?
The fastest way to verify a zen.co.uk email address is to use our free email checker. Enter any @zen.co.uk mailbox at the top of this page and our system performs a real-time SMTP handshake against zen.co.uk'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 zen.co.uk email exists without sending a message?
Yes. Our real-time email verification API connects directly to zen.co.uk'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 zen.co.uk mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for zen.co.uk?
zen.co.uk currently publishes 1 mail exchange (MX) record. The primary MX is mailcluster.zen.co.uk, which is the first server contacted when other mail systems try to deliver email to a zen.co.uk 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 zen.co.uk.
Does zen.co.uk use SPF, DKIM, and DMARC email authentication?
zen.co.uk 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 @zen.co.uk is genuine, and zen.co.uk's DMARC policy of 'quarantine' instructs receivers how to handle messages that fail those checks.
Why do emails to zen.co.uk bounce or get blocked?
Bounces from zen.co.uk 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 zen.co.uk'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 zen.co.uk's receivers trust you.
How can I verify a large list of zen.co.uk email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of zen.co.uk addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, zen.co.uk 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 zen.co.uk email addresses?
Yes, with normal hygiene. zen.co.uk is a legitimate email service and signups from @zen.co.uk 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 zen.co.uk by default.
What email format does zen.co.uk use for usernames?
Most zen.co.uk mailboxes follow common patterns like first.last@zen.co.uk, firstinitiallast@zen.co.uk, or first@zen.co.uk, but the actual local-part rules depend on Zen Internet. The only reliable way to confirm whether a specific @zen.co.uk 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 zen.co.uk risk score calculated?
The 0-to-100 risk score for zen.co.uk 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 zen.co.uk score is recomputed on every audit so it always reflects the live state of the domain.
Is zen.co.uk a valid ISP email domain?
Yes, zen.co.uk is a valid email domain provided by Zen Internet to its internet subscribers. It is a legitimate ISP-issued email address.
Is zen.co.uk a disposable or temporary email provider?
No, zen.co.uk is not a disposable or temporary email provider. It is an ISP-provided email service tied to an internet subscription from Zen Internet.
What mail server does zen.co.uk use?
zen.co.uk uses mail servers operated by Zen Internet. Check the MX records section above for specific server details and authentication configuration.
Can I send marketing emails to zen.co.uk addresses?
Yes, you can send marketing emails to zen.co.uk addresses with proper opt-in consent. ISP email providers apply spam filtering, and addresses may become inactive if subscribers cancel their internet service. Regular list verification is recommended.
How do I verify an email address at zen.co.uk?
Use BulkEmailChecker to verify zen.co.uk addresses via SMTP checks. ISP domains may have specific rate limiting or greylisting behaviors. Our tool handles these provider-specific configurations automatically.