Is u-tokyo.ac.jp a valid email domain?
Mail for u-tokyo.ac.jp is handled by 3 servers, with utmail4.nc.u-tokyo.ac.jp tried first.
It is not a free provider and is not on our disposable list, so addresses here usually belong to a company, school or other organisation.
SPF is published and ends with -all. DMARC is set to reject.
Check an email address at u-tokyo.ac.jp
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MX records
| Priority | Mail server | Resolves to |
|---|---|---|
| 25 | utmail4.nc.u-tokyo.ac.jp | 133.11.205.143, 2001:200:180:452:20c:29ff:fe6a:fa28 |
| 30 | utmail3.nc.u-tokyo.ac.jp | 133.11.205.154, 2001:200:180:452:20c:29ff:fe3e:36a7 |
| 50 | utmail5.nc.u-tokyo.ac.jp | 2001:200:180:452:20c:29ff:fe42:7644 |
SPF
Record published
v=spf1 include:spf0.cert.u-tokyo.ac.jp -all
DMARC
Policy: reject
v=DMARC1;p=reject;np=reject;sp=none;rua=mailto:dmarc@momo.nc.u-tokyo.ac.jp
Disposable?
No, not on our disposable list.
Free provider?
No, not a known free provider.
What this means for your email list
What this means for addresses at this domain
Mail routing for u-tokyo.ac.jp is healthy, so the domain is not the risk. The risk is the mailbox: outdated contacts, shared inboxes and catch-all servers. A mailbox-level check tells you which addresses are safe to send to.
Sender authentication
u-tokyo.ac.jp has a strict DMARC policy (reject): mail that fails authentication is refused, which protects its brand from spoofing and means anyone sending as u-tokyo.ac.jp must have SPF and DKIM set up correctly.
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Sign up to get a report summary →Frequently asked questions
- Is u-tokyo.ac.jp a valid email domain?
- Yes. u-tokyo.ac.jp publishes 3 MX records and can receive email. Whether a particular mailbox exists is a separate question that only a mailbox check can answer.
- Is u-tokyo.ac.jp a disposable email domain?
- No. u-tokyo.ac.jp is not on our disposable list. The list is updated regularly, and new throwaway domains appear all the time.
- What are the MX records for u-tokyo.ac.jp?
- utmail4.nc.u-tokyo.ac.jp (priority 25); utmail3.nc.u-tokyo.ac.jp (priority 30); utmail5.nc.u-tokyo.ac.jp (priority 50).
- Does u-tokyo.ac.jp have SPF and DMARC?
- SPF: yes, ending -all. DMARC: yes, policy reject.