Domain Intelligence
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Op Email Verification

Safe to Send

Op.pl is operated by Onet Poczta. The domain runs 1 mail exchange and SMTP is responsive, with 2 of 3 authentication standards in place.

Safe to Send
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Verify @op.pl emails

Live SMTP handshake against op.pl mail servers. No email is sent. 10 free per day, no signup.

@op.pl
No email sent No signup Real-time SMTP

Trusted by 400,000+ senders

4.9/5
From 8,500+ verified reviews
I run cold for an agency. We've used Hunter, NeverBounce, and ZeroBounce. This matches them on accuracy and is meaningfully cheaper at our volume. Switched everything over in March. Priya Nair
SOC 2 Type II GDPR CCPA 99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
Yes
Mail server responds to SMTP handshake
MX Records
1
Mail exchangers

Mail Exchange (MX) Records for op.pl Mail Exchange records. They tell other mail servers which hosts are responsible for receiving email at this domain, in priority order. Lower priority numbers are tried first.

1 RECORD
#1
mx.poczta.onet.pl 213.180.147.146
Reachable
SMTP Handshake Simple Mail Transfer Protocol. We open a live SMTP connection to the primary MX and read the greeting banner. A response confirms the mail server is alive and accepting connections. Responsive
BANNER220-mx.poczta.onet.pl ESMTP
Primary mail server accepted SMTP connection and returned a banner during the live audit.

op.pl Email Authentication SPF · DKIM · DMARC

2/3 PASS
SPF Sender Policy Framework. A DNS record listing which servers are allowed to send mail for this domain. Receivers reject or flag mail from unauthorized servers. Pass
TXTv=spf1 redirect=onet.pl
Authorized senders are defined and pass SPF policy.
DKIM DomainKeys Identified Mail. The sending server cryptographically signs outbound mail with a private key, and receivers verify the signature using a public key in DNS. Missing
No DKIM signature detected on common selectors for op.pl.
No DKIM signature was detected. Receivers cannot verify the integrity of outbound mail.
DMARC Domain-based Message Authentication, Reporting & Conformance. Tells receivers what to do when SPF or DKIM checks fail: none, quarantine, or reject. Quarantine
TXTv=DMARC1; p=quarantine; sp=quarantine; rua=mailto:dfe19035@in.mailhardener.com,mailto:dmarc-reports@onet.pl; ruf=mailto:dfe19035@in.mailhardener.com,mailto:dmarc-reports@onet.pl
Receivers are instructed to quarantine (route to spam) any mail that fails SPF or DKIM.

op.pl Domain Registration WHOIS · Nameservers · Registrar

26 YEARS OLD
Registrarcyber_Folks S.A.
IANA ID4328
Age26 years
TLD.pl
Authoritative Nameservers (4)
  • ns17.ringpublishing.net
  • ns18.ringpublishing.net
  • ns19.ringpublishing.net
  • ns20.ringpublishing.net
About this Domain

About op.pl

op.pl is a Polish email service associated with Onet Poczta, part of the Onet.pl portal ecosystem in Poland. The domain provides free email as an alternative address within Onet's email infrastructure.

op.pl shares Onet's authentication infrastructure with SPF and DKIM support. Anti-spam protections are consistent across all Onet email domains. Compliant with EU GDPR.

The op.pl mail servers validate recipients and reject invalid addresses. The domain does not function as catch-all. Standard rate limiting applies.

For delivery to op.pl, authenticate with SPF and DKIM. Follow the same practices as for onet.pl. Comply with EU anti-spam regulations.

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Common Questions About op.pl

Is op.pl a disposable or temporary email provider?
No. op.pl is not a disposable email provider. It is classified as Free Email Provider operated by Onet Poczta and addresses on op.pl are persistent rather than throwaway. Mail sent to a valid op.pl mailbox reaches a real recipient.
How do I verify if a op.pl email address is valid?
The fastest way to verify a op.pl email address is to use our email checker. Enter any @op.pl mailbox at the top of this page and our system performs a real-time SMTP handshake against op.pl's mail servers, confirming whether the mailbox exists, is reachable, and is safe to send to. No email is ever delivered during the check.
Can I check if a op.pl email exists without sending a message?
Yes. Our real-time email verification API connects directly to op.pl's mail server, opens an SMTP session, and queries the mailbox using the RCPT TO command without ever transmitting an actual email. The server's response confirms whether the op.pl mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for op.pl?
op.pl currently publishes 1 mail exchange (MX) record. The primary MX is mx.poczta.onet.pl, which is the first server contacted when other mail systems try to deliver email to a op.pl address. The full list with priorities and IP addresses is in the MX Records panel above. MX records tell sending servers where to route email for op.pl.
Does op.pl use SPF, DKIM, and DMARC email authentication?
op.pl has 2 of the 3 standard email authentication records in place: SPF, and DMARC (policy: quarantine). Adding the missing layer(s) would tighten anti-spoofing protection and improve deliverability for legitimate op.pl mail.
Why do emails to op.pl bounce or get blocked?
Bounces from op.pl usually fall into three buckets: the mailbox doesn't exist (5xx user unknown), the inbox is full, or your sending domain isn't authenticated to op.pl's satisfaction. The fastest fix is to run each address through a free email verifier before you send, and to make sure your own SPF, DKIM, and DMARC are configured correctly so op.pl's receivers trust you.
How can I verify a large list of op.pl email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of op.pl addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, op.pl catch-all detection, role-account detection, and disposable-domain matching. Results typically come back within minutes and previously-failed addresses on your blacklist are reprocessed for free. For continuous high-volume needs, see our unlimited email verification API.
Is it safe to accept signups from op.pl email addresses?
Yes, with normal hygiene. op.pl is a legitimate email service and signups from @op.pl behave like any other real user. Pipe each address through a real-time email verifier API at the moment of signup to catch typos and dead mailboxes, but there is no need to block op.pl by default.
What email format does op.pl use for usernames?
Most op.pl mailboxes follow common patterns like first.last@op.pl, firstinitiallast@op.pl, or first@op.pl, but the actual local-part rules depend on Onet Poczta. The only reliable way to confirm whether a specific @op.pl address exists is to run it through a free email verification tool. Guessing patterns will produce a high bounce rate and damage your sender reputation.
How is the op.pl risk score calculated?
The 0-to-100 risk score for op.pl combines disposable-domain classification, mail-server reachability, MX record presence and depth, SPF / DKIM / DMARC enforcement, DMARC policy strength, SMTP banner response, and domain age. Lower scores mean safer to send to. Disposable domains are pinned at the high end of the scale. The op.pl score is recomputed on every audit so it always reflects the live state of the domain.
Is op.pl a valid email domain?
Yes, op.pl is a valid free email domain operated by Onet Poczta. It provides permanent email accounts to users.
Is op.pl a disposable or temporary email provider?
No, op.pl is not a disposable or temporary email provider. It offers permanent email accounts with standard email features.
What mail server does op.pl use?
op.pl uses mail servers operated by Onet Poczta. Check the MX records section above for specific server details.
Can I send marketing emails to op.pl addresses?
Yes, with proper opt-in consent. Follow email best practices and ensure SPF, DKIM, and DMARC authentication is configured for your sending domain.
How do I verify an email address at op.pl?
Use BulkEmailChecker to verify op.pl addresses via SMTP checks. Verification behavior varies by provider. Our tool handles provider-specific rate limiting automatically.