Email domain
o2online.de email servers, SPF and DMARC
Mail for @o2online.de goes to mx.o2online.de (MX priority 10) and 3 backup hosts, as DNS showed on 5 November 2026. The host sits under o2online.de. The domain publishes an SPF record ending in -all and a DMARC policy of p=none, which decide whether mail claiming to be from @o2online.de is trusted.
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o2online.de mail DNS on 5 November 2026
| Priority | MX host | Platform |
|---|---|---|
| 10 | mx.o2online.de | Not identified |
| 100 | mx2c52.megamailservers.eu | Not identified |
| 110 | mx3c52.megamailservers.eu | Not identified |
| 120 | mx4c52.megamailservers.eu | Not identified |
| SPF | v=spf1 ip4:82.113.101.0/24 ip4:212.23.125.184 ip4:46.28.184.125 include:spf.mail.telefonica.de include:spfc50.megamailservers.eu include:spf.mailjet.com -all |
|---|---|
| DMARC | v=DMARC1; p=none; rua=mailto:[email protected] |
| MTA-STS | None published |
| TLS reporting | v=TLSRPTv1; rua=mailto:[email protected] |
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.
o2online.de MX records
o2online.de publishes 4 MX hosts; senders try the lowest priority number first (mx.o2online.de, 10) and fall back to the others in order.
o2online.de SPF record
The record on 5 November 2026 was v=spf1 ip4:82.113.101.0/24 ip4:212.23.125.184 ip4:46.28.184.125 include:spf.mail.telefonica.de include:spfc50.megamailservers.eu include:spf.mailjet.com -all.
In plain terms, it delegates to spf.mail.telefonica.de, spfc50.megamailservers.eu and spf.mailjet.com and lists 3 IP ranges directly. The top level uses 3 DNS-querying terms; 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.
o2online.de 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 report.mail.telefonica.de, so the domain's owner sees who sends mail as @o2online.de.
o2online.de TLS policy
It also asks for TLS reports with v=TLSRPTv1; rua=mailto:[email protected] (RFC 8460).
Can you verify @o2online.de addresses?
Our checker treats @o2online.de 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 mx.o2online.de answers for @o2online.de, 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.
Common questions
- What are the MX records for o2online.de?
- On 5 November 2026:
mx.o2online.de(priority 10),mx2c52.megamailservers.eu(priority 100),mx3c52.megamailservers.eu(priority 110),mx4c52.megamailservers.eu(priority 120). - Does o2online.de have SPF and DMARC?
- On 5 November 2026
o2online.depublished an SPF record ending in-alland a DMARC policy ofp=none. - Is o2online.de a disposable email domain?
- No.
o2online.deis not on the disposable domain list our checker uses, so @o2online.de addresses are checked like any other mailbox. See the disposable domain checker for the list.
Free checks for @o2online.de lists
- Bulk email checker for a pasted list or CSV
- Verify a whole file with a reason for every row
- 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.
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