Email domain
op.pl email servers, SPF and DMARC
Mail for @op.pl goes to mx.poczta.onet.pl (MX priority 1), as DNS showed on 5 November 2026. The host sits under onet.pl. The domain publishes an SPF record v=spf1 redirect=onet.pl and a DMARC policy of p=quarantine, which decide whether mail claiming to be from @op.pl is trusted.
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op.pl mail DNS on 5 November 2026
| Priority | MX host | Platform |
|---|---|---|
| 1 | mx.poczta.onet.pl | Not identified |
| SPF | v=spf1 redirect=onet.pl |
|---|---|
| DMARC | v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:[email protected],mailto:[email protected]; ruf=mailto:[email protected],mailto:[email protected] |
| MTA-STS | v=STSv1; id=20240216T010101 |
| TLS reporting | v=TLSRPTv1; rua=https://reporting.onet.pl/v1/tlsrpt,mailto:[email protected],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.
op.pl MX records
op.pl publishes a single MX host, mx.poczta.onet.pl. 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.
op.pl SPF record
The record on 5 November 2026 was v=spf1 redirect=onet.pl.
In plain terms, it delegates to onet.pl. The top level uses 1 DNS-querying term; SPF allows 10 in total including nested includes (RFC 7208 §4.6.4).
op.pl DMARC policy
The record is v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:[email protected],mailto:[email protected]; ruf=mailto:[email protected],mailto:[email protected].
p=quarantine asks receivers to send failing mail to spam.
Aggregate reports go to in.mailhardener.com and onet.pl, so the domain's owner sees who sends mail as @op.pl.
What that means for you: if a contact gives an @op.pl address and you send to them, nothing changes. But never put an @op.pl address in the From line of mail sent through your own tool or ESP. It can't pass DMARC for op.pl, and this policy tells receivers to junk it.
op.pl TLS policy
_mta-sts.op.pl publishes v=STSv1; id=20240216T010101, so op.pl uses MTA-STS: sending servers that support it must deliver over verified TLS or not at all (RFC 8461).
It also asks for TLS reports with v=TLSRPTv1; rua=https://reporting.onet.pl/v1/tlsrpt,mailto:[email protected],mailto:[email protected] (RFC 8460).
Domains on the same mail servers as op.pl
5 other domains published exactly the same MX hosts and SPF record as op.pl on 5 November 2026: autograf.pl, buziaczek.pl, poczta.onet.pl, vp.pl and spoko.pl. Mail to any of them lands on the same servers.
op.pl shares mx.poczta.onet.pl with onet.pl. When we tested those servers for onet.pl on 12 October 2026, the result was: Verifiable. The server rejects unknown recipients during the SMTP conversation.
Can you verify @op.pl addresses?
Our checker treats @op.pl 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 tested @op.pl itself, but its mail goes to the same servers as onet.pl, so expect @op.pl results to follow the pattern described there. 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 op.pl?
- On 5 November 2026:
mx.poczta.onet.pl(priority 1). - Does op.pl have SPF and DMARC?
- On 5 November 2026
op.plpublished an SPF recordv=spf1 redirect=onet.pland a DMARC policy ofp=quarantine. - Is op.pl a disposable email domain?
- No.
op.plis not on the disposable domain list our checker uses, so @op.pl addresses are checked like any other mailbox. See the disposable domain checker for the list. - Is op.pl the same mail system as autograf.pl?
- Its DNS says so: on 5 November 2026 both published the same MX hosts and SPF record, so mail to either lands on the same servers.
Free checks for @op.pl 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.
Got a list with @op.pl 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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