Is open.ac.uk a valid email domain?
Mail for open.ac.uk is handled by 2 servers at Microsoft (Outlook or Microsoft 365), with open-ac-uk.mail.protection.outlook.com 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 quarantine.
Check an email address at open.ac.uk
Type the name before the @ to check a full address. No account needed.
MX records (Microsoft (Outlook or Microsoft 365))
| Priority | Mail server | Resolves to |
|---|---|---|
| 10 | open-ac-uk.mail.protection.outlook.com | 52.101.91.156, 52.101.68.12 |
| 20 | open-ac-uk.mail.protection.outlook.com | 52.101.91.156, 52.101.68.12 |
SPF
Record published
v=spf1 include:spf.protection.outlook.com ip4:137.108.232.47 ip4:137.108.232.48 ip4:137.108.170.8 ip4:137.108.170.38 ip4:137.108.170.40 ip4:137.108.185.44 ip4:137.108.185.41 -all
DMARC
Policy: quarantine
v=DMARC1;p=quarantine;sp=quarantine;pct=100;rua=mailto:dmarc-rua@dmarc.service.gov.uk,mailto:dmarc@open.ac.uk,mailto:dmarc_agg@vali.email
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 open.ac.uk 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 The risk is the mailbox: outdated contacts, shared inboxes and catch-all servers.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
open.ac.uk uses a DMARC quarantine policy: mail that fails authentication is sent to spam. That is a sound middle step, and a good sign the owner looks after their email setup.
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Sign up to get a report summary →Frequently asked questions
- Is open.ac.uk a valid email domain?
- Yes. open.ac.uk publishes 2 MX records and can receive email. Whether a particular mailbox exists is a separate question that only a mailbox check can answer.
- Is open.ac.uk a disposable email domain?
- No. open.ac.uk 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 open.ac.uk?
- open-ac-uk.mail.protection.outlook.com (priority 10); open-ac-uk.mail.protection.outlook.com (priority 20).
- Does open.ac.uk have SPF and DMARC?
- SPF: yes, ending -all. DMARC: yes, policy quarantine.