Yes. You can verify any @Dion.ne.jp address in real time with a direct SMTP handshake that provides 99.7% accuracy. Dion.ne.jp is operated by DION (KDDI), runs 1 mail server, enforces 2 of 3 authentication standards, and is currently responding to SMTP.
Every check returns one of three clear outcomes so you know exactly what to do with the address.
The mailbox exists and accepts mail. Send with confidence, the address is deliverable.
The mailbox does not exist, is disposable, or will hard-bounce. Remove it to protect your sender reputation.
The server is catch-all or greylisting, so existence cannot be confirmed. Send selectively and watch engagement.
dion.ne.jp publishes 1 MX record. The primary mail exchanger is fa1217.secure.jp, hosted by secure.jp, and it is currently reachable and answering SMTP. Mail is routed through these servers in priority order, lowest number first.
| Priority | Hostname | IP | Status |
|---|---|---|---|
| 10 | fa1217.secure.jp | 150.60.200.156 | Reachable |
220 fa1217.secure.jp ESMTPYes. dion.ne.jp is a valid email domain, operated by DION (KDDI). Addresses are persistent and real mail reaches a genuine recipient. Individual mailboxes still go stale, so verify each one before you send.
A live SMTP handshake connects to Dion.ne.jp's mail server and asks whether the mailbox exists using the RCPT TO command, without ever transmitting a message. The recipient never sees the check.
Each address runs through 30+ checks including SMTP existence, catch-all detection, role-account filtering, and disposable matching. The same engine has verified billions of addresses since 2012.
Every unverified address is a gamble. Here is what happens when you skip verification and mail a list that has not been cleaned.
Free inboxes get abandoned constantly. Verification drops the dead dion.ne.jp mailboxes before you mail them.
Mistyped dion.ne.jp addresses fail a real SMTP check, so they never turn into a hard bounce.
A clean list keeps your bounce rate low, and a low bounce rate is what protects inbox placement on a big send.
Mailing only live dion.ne.jp addresses raises every rate that matters: opens, clicks, and replies.
Dion.ne.jp is DION (KDDI) and first seen May 2, 1997.
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.
Upload a CSV or TXT list of Dion.ne.jp addresses to the bulk email verifier. Every address runs through a live SMTP handshake plus catch-all, role-account and disposable detection, and you download a clean list when processing completes. For real-time checks at signup, use the real-time email verification API.
CSV or TXT with one email per line. No formatting needed.
Each Dion.ne.jp address is checked with a live server handshake.
Get a verified list with status codes, risk flags, and catch-all detection.
Pay as you go. No subscriptions, and credits never expire.
Everything about verifying email at this domain.
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.
Upload a CSV or TXT list to the bulk email verifier. Every address runs through 30+ checks including SMTP existence, catch-all detection, role-account, and disposable matching. Processing time depends on list size.
99.7% accurate using a direct SMTP handshake with dion.ne.jp's mail servers, the same engine that has verified billions of addresses since 2012.
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