Is outlook.office365.com a valid email domain?
outlook.office365.com has no MX record, so mail falls back to the domain's own address record. Most senders still deliver, but it is a fragile setup.
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.
No SPF record was found. DMARC is set to reject.
Check an email address at outlook.office365.com
Type the name before the @ to check a full address. No account needed.
MX records
| Priority | Mail server | Resolves to |
|---|---|---|
| 0 | outlook.office365.com | 40.99.155.226, 40.99.149.146 |
SPF
No record found
DMARC
Policy: reject
v=DMARC1; p=reject; pct=100; rua=mailto:rua@dmarc.microsoft; ruf=mailto:ruf@dmarc.microsoft; fo=1
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
The domain accepts mail, but whether a given person's mailbox exists depends on that organisation. Company domains often have staff who left, role mailboxes like info@ and sales@, and sometimes catch-all rules that accept everything. Verify the individual address before you send.
Sender authentication
outlook.office365.com has a strict DMARC policy (reject): mail that fails authentication is refused, which protects its brand from spoofing and means anyone sending as outlook.office365.com must have SPF and DKIM set up correctly.
✨ Report summary
Sign up to get a report summary: a plain-English read of this domain's mail setup and what to do next.
Sign up to get a report summary →Frequently asked questions
- Is outlook.office365.com a valid email domain?
- Yes. outlook.office365.com publishes an address record that mail falls back to and can receive email. Whether a particular mailbox exists is a separate question that only a mailbox check can answer.
- Is outlook.office365.com a disposable email domain?
- No. outlook.office365.com 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 outlook.office365.com?
- outlook.office365.com (priority 0).
- Does outlook.office365.com have SPF and DMARC?
- SPF: no record found. DMARC: yes, policy reject.