Domain Intelligence
Last Updated:
Lineone.net
Safe to Send
Lineone.net is operated by LineOne. The domain runs 4 mail exchanges and SMTP is responsive, with 2 of 3 authentication standards in place.
Safe to Send
RISK
17
/100
Low
Verify Mailbox
Verify @lineone.net emails
Live SMTP handshake against lineone.net 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
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
4
Mail exchangers
Mail Exchange (MX) Records for lineone.net 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
mx003.tt.xion.oxcs.net 135.125.7.163
Reachable
#10
mx002.tt.xion.oxcs.net 51.89.43.215
Reachable
#10
mx004.tt.xion.oxcs.net 135.125.7.164
Reachable
#10
mx001.tt.xion.oxcs.net 51.89.43.216
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 Welcome to mx03.oxseu-vadesecure.net ESMTP oxseu3nmtai03p
Primary mail server accepted SMTP connection and returned a banner during the live audit.
lineone.net 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 a mx include:spf.shared.xion.oxcs.net include:_spf.talktalk.net ~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 lineone.net.
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; fo=1; ri=3600; rua=mailto:1cf493e1@inbox.ondmarc.com,mailto:talktalk-dmarc@open-xchange.com; ruf=mailto:1cf493e1@inbox.ondmarc.com,mailto:talktalk-dmarc@open-xchange.com;
Strict policy. Receivers are instructed to reject any mail that fails SPF or DKIM. The strongest available setting.
lineone.net Domain Registration WHOIS · Nameservers · Registrar
RegistrarCSC Corporate Domains, Inc.
IANA ID299
RegisteredApril 1, 1997
Last UpdatedApril 22, 2026
ExpiresApril 3, 2027
Age29 years
TLD.net
Authoritative Nameservers (2)
- NS0.AS9105.COM
- ns0.tiscali.co.uk
Registrant
TalkTalk Communications Limited
ENG, UNITED KINGDOM
About this Domain
About lineone.net
lineone.net is the email domain for LineOne, a former UK internet service provider. LineOne was a joint venture between BT and United News and Media, offering dial-up internet and email services. The service was eventually absorbed into BT Internet. Legacy lineone.net email accounts continue to be maintained.
lineone.net supports SPF authentication through BT infrastructure. DKIM and DMARC configurations are maintained at standard levels. Proper authentication alignment is important for delivery to lineone.net mailboxes.
The lineone.net mail servers, managed by BT infrastructure, validate recipients and apply standard anti-spam filtering including reputation evaluation and content analysis.
For delivery to lineone.net, authenticate with SPF and DKIM, maintain clean lists, and comply with UK GDPR and PECR regulations. BT delivery practices apply to legacy LineOne domains.
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Common Questions About lineone.net
Is lineone.net a disposable or temporary email provider?
No. lineone.net is not a disposable email provider. It is classified as ISP Email Provider operated by LineOne and addresses on lineone.net are persistent rather than throwaway. Mail sent to a valid lineone.net mailbox reaches a real recipient.
How do I verify if a lineone.net email address is valid?
The fastest way to verify a lineone.net email address is to use our free email checker. Enter any @lineone.net mailbox at the top of this page and our system performs a real-time SMTP handshake against lineone.net'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 lineone.net email exists without sending a message?
Yes. Our real-time email verification API connects directly to lineone.net'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 lineone.net mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for lineone.net?
lineone.net currently publishes 4 mail exchange (MX) records. The primary MX is mx003.tt.xion.oxcs.net, which is the first server contacted when other mail systems try to deliver email to a lineone.net 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 lineone.net.
Does lineone.net use SPF, DKIM, and DMARC email authentication?
lineone.net 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 lineone.net mail.
Why do emails to lineone.net bounce or get blocked?
Bounces from lineone.net 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 lineone.net'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 lineone.net's receivers trust you.
How can I verify a large list of lineone.net email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of lineone.net addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, lineone.net 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 lineone.net email addresses?
Yes, with normal hygiene. lineone.net is a legitimate email service and signups from @lineone.net 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 lineone.net by default.
What email format does lineone.net use for usernames?
Most lineone.net mailboxes follow common patterns like first.last@lineone.net, firstinitiallast@lineone.net, or first@lineone.net, but the actual local-part rules depend on LineOne. The only reliable way to confirm whether a specific @lineone.net 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 lineone.net risk score calculated?
The 0-to-100 risk score for lineone.net 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 lineone.net score is recomputed on every audit so it always reflects the live state of the domain.
Is lineone.net a valid email domain?
Yes, lineone.net is a valid email domain originally operated by LineOne (BT/United News joint venture), now maintained by BT. Legacy email accounts remain active for existing UK subscribers.
Is lineone.net a disposable or temporary email service?
No, lineone.net is not a disposable or temporary email service. It is a permanent ISP email domain with legacy accounts maintained by BT for former LineOne subscribers in the UK.
What mail servers does lineone.net use?
lineone.net uses mail servers managed by BT infrastructure. The MX records direct inbound email to BT-operated gateways for filtering and delivery to legacy LineOne mailboxes.
Can I send marketing emails to lineone.net addresses?
You can send marketing emails to lineone.net addresses with valid opt-in consent. Authenticate with SPF and DKIM, comply with UK GDPR and PECR, and honor unsubscribe requests.
How do I verify a lineone.net email address?
You can verify a lineone.net email address using an email verification service that checks MX records and performs SMTP-level validation to confirm the mailbox is active.