Domain Intelligence
Last Updated:
Centrum.sk
Safe to Send
Centrum.sk is operated by Centrum Holdings Slovakia. The domain runs 4 mail exchanges and SMTP is responsive, with 2 of 3 authentication standards in place.
Safe to Send
RISK
22
/100
Low
Verify Mailbox
Verify @centrum.sk emails
Live SMTP handshake against centrum.sk mail servers. No email is sent. 10 free per day, no signup.
Trusted by 400,000+ senders
4.9/5
From 8,500+ verified reviews
Ran our entire 47k cold outbound list through this before our Q1 push. Bounce rate dropped from 9.4% to 0.8%. The SMTP-level catch on outdated B2B contacts is what set this apart from the other verifiers I tried. Andrew Mitchell · Sr. Demand Gen Manager
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
4
Mail exchangers
Mail Exchange (MX) Records for centrum.sk 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.
#10
nm-sk-10mx2.eco-mx.cz 46.255.227.8
Reachable
#10
nm-sk-10mx1.eco-mx.cz 46.255.225.8
Reachable
#20
nm-sk-20mx1.eco-mx.cz 46.255.227.8
Reachable
#20
nm-sk-20mx2.eco-mx.cz 46.255.225.8
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 antispam21.centrum.cz ESMTP
Primary mail server accepted SMTP connection and returned a banner during the live audit.
centrum.sk Email Authentication SPF · DKIM · DMARC
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=_spf.centrum.cz
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.
Pass
SELECTORDetected via standard selectors
A DKIM signature was detected. Outbound mail from this domain can be cryptographically verified.
DMARC
Domain-based Message Authentication, Reporting & Conformance. Tells receivers what to do when SPF or DKIM checks fail: none, quarantine, or reject.
Missing
No DMARC record published at _dmarc.centrum.sk.
No DMARC policy is published. Receivers have no instruction for handling failed messages from this domain.
centrum.sk Domain Registration WHOIS · Nameservers · Registrar
RegistrarNews and Media Holding a.s.
IANA ID2242
RegisteredJune 20, 2003
Last UpdatedApril 28, 2025
ExpiresJune 20, 2026
Age22 years
TLD.sk
Authoritative Nameservers (2)
- chuck.ns.cloudflare.com
- erin.ns.cloudflare.com
Technical Contact
News and Media Holding a.s.
News and Media Holding a.s.
dnsadmins@newsandmedia.sk·Bratislava, SLOVAKIA·421232153111
About this Domain
About centrum.sk
centrum.sk is a Slovak email and web portal service operated by Centrum Holdings Slovakia, the Slovak branch of the Czech-based digital media company. The platform provides free email alongside news and internet services to Slovak-speaking users. Centrum.sk has been a recognized name in the Slovak online landscape since the early 2000s.
centrum.sk implements SPF authentication for outbound email validation, with DKIM and DMARC policies following the platform's infrastructure configuration. As a Slovak internet service, centrum.sk complies with EU data protection requirements (GDPR) and maintains anti-spam measures appropriate for the Slovak market.
The centrum.sk mail servers enforce recipient verification at the SMTP level, rejecting messages addressed to nonexistent accounts. The domain does not operate as a catch-all. Inbound rate limiting may apply, especially for connections from international IP addresses with limited sending history to Slovak email platforms.
For reliable delivery to centrum.sk recipients, configure SPF and DKIM authentication on your sending domain. Follow EU email marketing regulations and include proper unsubscribe mechanisms. Maintain clean mailing lists and process bounce notifications promptly to preserve good deliverability to Slovak email services.
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Common Questions About centrum.sk
Is centrum.sk a disposable or temporary email provider?
No. centrum.sk is not a disposable email provider. It is classified as Free Email Provider operated by Centrum Holdings Slovakia and addresses on centrum.sk are persistent rather than throwaway. Mail sent to a valid centrum.sk mailbox reaches a real recipient.
How do I verify if a centrum.sk email address is valid?
The fastest way to verify a centrum.sk email address is to use our free email checker. Enter any @centrum.sk mailbox at the top of this page and our system performs a real-time SMTP handshake against centrum.sk'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 centrum.sk email exists without sending a message?
Yes. Our real-time email verification API connects directly to centrum.sk'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 centrum.sk mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for centrum.sk?
centrum.sk currently publishes 4 mail exchange (MX) records. The primary MX is nm-sk-10mx2.eco-mx.cz, which is the first server contacted when other mail systems try to deliver email to a centrum.sk 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 centrum.sk.
Does centrum.sk use SPF, DKIM, and DMARC email authentication?
centrum.sk has 2 of the 3 standard email authentication records in place: SPF, DKIM and . Adding the missing layer(s) would tighten anti-spoofing protection and improve deliverability for legitimate centrum.sk mail.
Why do emails to centrum.sk bounce or get blocked?
Bounces from centrum.sk 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 centrum.sk'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 centrum.sk's receivers trust you.
How can I verify a large list of centrum.sk email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of centrum.sk addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, centrum.sk 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 centrum.sk email addresses?
Yes, with normal hygiene. centrum.sk is a legitimate email service and signups from @centrum.sk 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 centrum.sk by default.
What email format does centrum.sk use for usernames?
Most centrum.sk mailboxes follow common patterns like first.last@centrum.sk, firstinitiallast@centrum.sk, or first@centrum.sk, but the actual local-part rules depend on Centrum Holdings Slovakia. The only reliable way to confirm whether a specific @centrum.sk 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 centrum.sk risk score calculated?
The 0-to-100 risk score for centrum.sk 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 centrum.sk score is recomputed on every audit so it always reflects the live state of the domain.
Is centrum.sk a valid email domain?
Yes, centrum.sk is a valid free email domain operated by Centrum Holdings Slovakia. It provides permanent email accounts to users.
Is centrum.sk a disposable or temporary email provider?
No, centrum.sk is not a disposable or temporary email provider. It offers permanent email accounts with standard email features.
What mail server does centrum.sk use?
centrum.sk uses mail servers operated by Centrum Holdings Slovakia. Check the MX records section above for specific server details.
Can I send marketing emails to centrum.sk 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 centrum.sk?
Use BulkEmailChecker to verify centrum.sk addresses via SMTP checks. Verification behavior varies by provider. Our tool handles provider-specific rate limiting automatically.