Yes. You can verify any @U-tokyo.ac.jp address in real time with a direct SMTP handshake that provides 99.7% accuracy. U-tokyo.ac.jp is operated by University of Tokyo, runs 3 mail servers, 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.
u-tokyo.ac.jp publishes 3 MX records. The primary mail exchanger is utmail4.nc.u-tokyo.ac.jp, hosted by ac.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 |
|---|---|---|---|
| 25 | utmail4.nc.u-tokyo.ac.jp | 133.11.205.143 | Reachable |
| 30 | utmail3.nc.u-tokyo.ac.jp | 133.11.205.154 | Reachable |
| 50 | utmail5.nc.u-tokyo.ac.jp | Reachable |
220 u-tokyo.ac.jp ESMTP Sendmail 8.18.1/8.18.1; Mon, 1 Jun 2026 17:58:36 +0900 (JST)Yes. u-tokyo.ac.jp is a valid email domain, operated by University of Tokyo. 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 U-tokyo.ac.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.
People leave companies. Verification flags u-tokyo.ac.jp mailboxes deactivated since you collected them.
Expired or full u-tokyo.ac.jp inboxes hard-bounce. A live SMTP check catches them before you hit send.
Low bounce rates keep you trusted by u-tokyo.ac.jp mail servers and the major mailbox providers.
Verified contacts mean your CRM, lead scoring, and routing all run on addresses that reach a person.
U-tokyo.ac.jp is University of Tokyo and first seen Jun 8, 2020.
U-tokyo.ac.jp is University of Tokyo, classified as education email running on ac.jp. It operates 3 mail servers and currently accepts SMTP connections.
When verifying u-tokyo.ac.jp addresses, the checker connects directly to ac.jp over SMTP. With 2 of 3 authentication standards in place and SMTP currently responding, verification results for this domain carry high confidence.
Upload a CSV or TXT list of U-tokyo.ac.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 U-tokyo.ac.jp address is checked with a live server handshake.
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Yes, u-tokyo.ac.jp is a valid educational institution email domain operated by University of Tokyo. It is used by students, faculty, and staff for academic correspondence.
No, u-tokyo.ac.jp is not a disposable or temporary email provider. It is an institutional email domain. However, student email addresses may be deactivated after graduation depending on the institution's policy.
u-tokyo.ac.jp uses mail servers managed by or on behalf of University of Tokyo. Many universities use Microsoft 365 or Google Workspace for their email infrastructure. Check the MX records section above for details.
You can send emails to u-tokyo.ac.jp addresses with proper consent. Be aware that educational institutions often employ strict spam filtering, and student addresses may become inactive after graduation. Regular list hygiene is recommended.
Use BulkEmailChecker to verify u-tokyo.ac.jp addresses. Educational domains may use catch-all configurations or have specific SMTP behaviors. Our tool handles these institution-specific configurations automatically.
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 u-tokyo.ac.jp's mail servers, the same engine that has verified billions of addresses since 2012.
Other education email domains we have audited.