Email domain · Microsoft 365 (Exchange Online)
ono.com email servers, SPF and DMARC
Mail for @ono.com goes to ono-com.mail.protection.outlook.com (MX priority 0), as DNS showed on 5 November 2026. These are Microsoft 365 (Exchange Online) servers. The domain publishes an SPF record ending in -all and a DMARC policy of p=none, which decide whether mail claiming to be from @ono.com is trusted.
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ono.com mail DNS on 5 November 2026
| Priority | MX host | Platform |
|---|---|---|
| 0 | ono-com.mail.protection.outlook.com | Microsoft 365 (Exchange Online) |
| SPF | v=spf1 include:spf.protection.outlook.com -all |
|---|---|
| DMARC | v=DMARC1; p=none; rua=mailto:[email protected] |
| MTA-STS | None published |
| TLS reporting | None published |
Read on 5 November 2026 with dig against 1.1.1.1 (8.8.8.8 as fallback); nothing sent to the mail servers. Check the records today with the email provider lookup.
ono.com MX records
ono.com publishes a single MX host, ono-com.mail.protection.outlook.com. With no backup host, a sender that can't reach it queues the message and retries until the server answers or the queue gives up.
11 other domains we checked on the same day also hand their mail to Microsoft 365 (Exchange Online) servers, with different records from ono.com: airtelmail.in, ciudad.com.ar, comhem.se, entelchile.net, in.gr, pldtdsl.net, plus.net, ptcl.net.pk and 3 more.
ono.com SPF record
The record on 5 November 2026 was v=spf1 include:spf.protection.outlook.com -all.
In plain terms, it delegates to spf.protection.outlook.com. The top level uses 1 DNS-querying term; SPF allows 10 in total including nested includes (RFC 7208 §4.6.4).
It ends in a hard fail (-all): receivers may reject mail from any server the record does not list.
ono.com DMARC policy
The record is v=DMARC1; p=none; rua=mailto:[email protected].
p=none only asks for reports; failing mail is delivered as normal.
Aggregate reports go to ono.com, so the domain's owner sees who sends mail as @ono.com.
Can you verify @ono.com addresses?
Our checker treats @ono.com like any domain: syntax, MX, disposable and role checks first, then a made-up address to rule out a catch-all, then your address at RCPT TO, disconnecting without sending. We have not published a test of how ono-com.mail.protection.outlook.com answers for @ono.com, so we make no claim here about whether single mailboxes can be confirmed; each result carries its own reason.
Cleaning a list with these addresses
DNS tells you where mail goes, not whether one person's mailbox still exists. For a list, run the whole file through a verifier before you send: invalid rows come out, risky rows (catch-all, unknown, refused) go in their own segment, and valid rows are safe to mail.
What Microsoft 365 (Exchange Online) documents for senders
- Microsoft 365 tells each organisation to point its MX record at a host of the form
<domain-key>.mail.protection.outlook.com. Microsoft: external DNS records for Microsoft 365 - Microsoft requires domains sending more than 5,000 messages a day to Outlook.com, Hotmail and Live addresses to pass SPF, DKIM and DMARC (at least p=none, aligned with SPF or DKIM). Microsoft: requirements for high-volume senders
Common questions
- What are the MX records for ono.com?
- On 5 November 2026:
ono-com.mail.protection.outlook.com(priority 0). - Does ono.com have SPF and DMARC?
- On 5 November 2026
ono.compublished an SPF record ending in-alland a DMARC policy ofp=none. - Is ono.com a disposable email domain?
- No.
ono.comis not on the disposable domain list our checker uses, so @ono.com addresses are checked like any other mailbox. See the disposable domain checker for the list.
Free checks for @ono.com lists
- Bulk email checker for a pasted list or CSV
- Verify a whole file with a reason for every row
- Microsoft 365 address checker
- SPF lookup counter
- MTA-STS checker
- Disposable email checker
Another domain? See every email domain we have mapped and what our checker does at each mailbox provider.
Got a list with @ono.com addresses?
Sign in with Google and the first 100 addresses are checked free: valid, risky and invalid, with the reason for each row and a file to download. No card. After that, plans start at $9/mo for 2,500 emails a month.
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