dion.ne.jp - Email Domain Verification & Deliverability Report

Active ISP Email Provider
Organization: DION (KDDI)
Mail Server: secure.jp
Verified 5 days ago

Real-time verification data for dion.ne.jp. View MX records, SPF/DKIM/DMARC authentication, and server deliverability status.

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MX Records for dion.ne.jp

PriorityMail ServerIP Address
10 fa1217.secure.jp 150.60.200.156
SMTP Status: Not Responding
SMTP Banner:
220 dion.ne.jp ESMTP Service Ready

dion.ne.jp uses secure.jp mail servers, which means emails are processed through secure.jp infrastructure with their built-in spam filtering and security controls.

Email Authentication for dion.ne.jp

SPF Record Pass

v=spf1 +ip4:106.187.230.0/24 +ip4:106.187.231.0/24 +ip4:111.87.219.128/25 ~all

SPF (Sender Policy Framework) specifies which mail servers are authorized to send email on behalf of dion.ne.jp.

DMARC Record None

v=DMARC1; p=none; rua=mailto:report_dmarc_rua.ez@ezweb.ne.jp

DMARC (Domain-based Message Authentication) tells receiving servers what to do with emails that fail authentication checks.

DKIM Not Detected

DKIM detection is limited from external scanning. The domain may use DKIM with selectors not covered by our scan.

Authentication Summary: dion.ne.jp has SPF and DMARC configured. This provides good protection against email spoofing. Senders can expect reliable email delivery to this domain.

WHOIS & Domain Information

Registration Details

Domain
dion.ne.jp
TLD
.ne.jp
Created
1997-05-02
Updated
2025-05-31
Expires
2026-05-31
Domain Age
28 years

Registrar

Registrant Contact

Organization
DION

Name Servers

  • dns0.dion.ne.jp
  • dns10.dion.ne.jp
  • dns2.dion.ne.jp
  • dnsa01.kddi.ne.jp
  • dnsa02.kddi.ne.jp
  • ns1.neweb.ne.jp

About dion.ne.jp

dion.ne.jp is the email domain for DION, the internet service brand of KDDI Corporation, one of Japan's largest telecommunications companies. DION provided broadband internet and email services to Japanese households before being rebranded to au one net and later au.com. Legacy dion.ne.jp email accounts continue to be maintained by KDDI.

dion.ne.jp supports SPF and DKIM authentication through KDDI's enterprise-grade infrastructure. DMARC policies are published at standard levels for Japanese ISP domains. Full authentication alignment is important for delivery to dion.ne.jp inboxes.

The dion.ne.jp mail servers, managed by KDDI, perform thorough recipient validation and apply comprehensive anti-spam filtering. Japanese ISP mail systems are cautious with international senders, often applying greylisting and additional scrutiny.

For delivery to dion.ne.jp, authenticate with SPF and DKIM, warm up sending IPs gradually, and maintain low bounce and complaint rates. Comply with Japan's Act on Regulation of Transmission of Specified Electronic Mail for commercial communications.

How to Verify dion.ne.jp Email Addresses

Need to check if an email address at dion.ne.jp actually exists before you send to it? BulkEmailChecker performs deep SMTP-level validation, connecting directly to dion.ne.jp's mail servers to confirm the mailbox is real, active, and able to receive your message. No test email is ever sent, so your sender reputation stays protected.

Verify a Single dion.ne.jp Email
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Have a mailing list full of dion.ne.jp addresses? Upload your CSV or TXT file to BulkEmailChecker and verify thousands of email addresses in minutes. Our bulk verification engine runs 30+ checks per address including syntax validation, DNS resolution, SMTP handshake, and spam trap detection. Clean your list before every campaign to keep bounce rates below 2% and protect your sender score. See bulk pricing.

Verify dion.ne.jp Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates dion.ne.jp email addresses at the point of entry, blocking invalid, disposable, and risky addresses before they enter your database. Integrate with a single API call and prevent bad data at the source.

Frequently Asked Questions

Yes, dion.ne.jp is a valid email domain operated by KDDI Corporation, one of Japan's largest telecom companies. Legacy DION email accounts remain active and are maintained by KDDI infrastructure.
No, dion.ne.jp is not a disposable or temporary email service. It is a permanent ISP email domain with legacy accounts maintained by KDDI for former DION broadband subscribers in Japan.
dion.ne.jp uses mail servers managed by KDDI enterprise infrastructure. The MX records direct inbound email to KDDI-operated gateways for filtering and delivery to legacy DION mailboxes.
You can send marketing emails to dion.ne.jp addresses with proper opt-in consent. Authenticate with SPF and DKIM, comply with Japanese anti-spam law, and provide clear unsubscribe mechanisms.
You can verify a dion.ne.jp email address using an email verification service that checks MX records and performs SMTP-level validation to confirm the mailbox is active and accepting email.
The fastest and most accurate way to verify a dion.ne.jp email address is to use BulkEmailChecker's free email verification tool. Simply enter the full email address and our system performs SMTP-level validation by connecting directly to dion.ne.jp's mail servers. You'll get instant results showing whether the mailbox exists, is deliverable, and is safe to send to, all without sending a single email.
Yes. BulkEmailChecker uses SMTP verification to check if a dion.ne.jp mailbox exists without ever delivering an email. Our system connects to the domain's mail server, performs an SMTP handshake, and queries the mail server to confirm whether the recipient address is valid. This process is completely invisible to the email recipient and does not affect your sender reputation.
Sending to invalid email addresses causes hard bounces, which directly damage your sender reputation. Internet Service Providers (ISPs) and email providers track your bounce rate, and if it exceeds 2%, your emails may start landing in spam folders or get blocked entirely. Verifying dion.ne.jp addresses with BulkEmailChecker before sending prevents bounces and keeps your deliverability high.
BulkEmailChecker's bulk verification service lets you upload a CSV or TXT file containing thousands of dion.ne.jp email addresses and verify them all at once. Each address goes through 30+ verification checks including syntax validation, DNS/MX lookup, SMTP verification, disposable domain detection, and spam trap identification. Results are typically ready within minutes and can be downloaded as a clean, verified list.
Email verification is the process of confirming that an email address is real, properly formatted, and capable of receiving messages. It matters because sending to invalid addresses causes bounces, damages your sender reputation, wastes marketing budget, and can get your sending IP blacklisted. BulkEmailChecker verifies addresses at the SMTP level, the most accurate method available, ensuring your emails reach real people.
MX (Mail Exchange) records are DNS entries that specify which mail servers are responsible for receiving email for a domain. When you send an email, your mail server looks up the recipient domain's MX records to find where to deliver the message. If a domain has no MX records, it cannot receive email. BulkEmailChecker checks MX records as part of every verification to confirm the domain is configured for email delivery.
A catch-all (or accept-all) domain is configured to accept email sent to any address at that domain, regardless of whether the specific mailbox exists. This makes it harder to verify individual addresses because the server always responds positively. BulkEmailChecker detects catch-all configurations and flags them in verification results so you can make informed decisions about sending to those addresses.
Yes. BulkEmailChecker offers a real-time email verification API that you can integrate into signup forms, CRM systems, lead capture tools, and any application that collects email addresses. The API validates addresses at the point of entry, blocking invalid, disposable, and risky emails before they enter your database. Integration takes just a single API call with response times under 3 seconds.

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