Yes. You can verify any @Post.cz address in real time with a direct SMTP handshake that provides 99.7% accuracy. Post.cz is operated by Seznam.cz, runs 2 mail servers, enforces 2 of 3 authentication standards, and is currently responding to SMTP.
Every check returns one of three clear outcomes so you know exactly what to do with the address.
The mailbox exists and accepts mail. Send with confidence, the address is deliverable.
The mailbox does not exist, is disposable, or will hard-bounce. Remove it to protect your sender reputation.
The server is catch-all or greylisting, so existence cannot be confirmed. Send selectively and watch engagement.
post.cz publishes 2 MX records. The primary mail exchanger is mx1.seznam.cz, hosted by seznam.cz, and it is currently reachable and answering SMTP. Mail is routed through these servers in priority order, lowest number first.
| Priority | Hostname | IP | Status |
|---|---|---|---|
| 5 | mx1.seznam.cz | 77.75.77.90 | Reachable |
| 10 | mx2.seznam.cz | 77.75.77.42 | Reachable |
220 email.seznam.cz ESMTPYes. post.cz is a valid email provider, operated by Seznam.cz. Addresses are persistent and real mail reaches a genuine recipient. Individual mailboxes still go stale, so verify each one before you send.
A live SMTP handshake connects to Post.cz's mail server and asks whether the mailbox exists using the RCPT TO command, without ever transmitting a message. The recipient never sees the check.
Each address runs through 30+ checks including SMTP existence, catch-all detection, role-account filtering, and disposable matching. The same engine has verified billions of addresses since 2012.
Every unverified address is a gamble. Here is what happens when you skip verification and mail a list that has not been cleaned.
Free inboxes get abandoned constantly. Verification drops the dead post.cz mailboxes before you mail them.
Mistyped post.cz addresses fail a real SMTP check, so they never turn into a hard bounce.
A clean list keeps your bounce rate low, and a low bounce rate is what protects inbox placement on a big send.
Mailing only live post.cz addresses raises every rate that matters: opens, clicks, and replies.
Post.cz is Seznam.cz, registered through REG-CZNIC and first seen Sep 6, 1997.
post.cz is a Czech email domain associated with Seznam.cz, the Czech Republic's largest internet portal. Based in Prague, Seznam provides free email through multiple domains including seznam.cz, email.cz, and post.cz for Czech users.
post.cz shares Seznam's authentication infrastructure with SPF and DKIM support. The service complies with EU GDPR and Czech data protection regulations.
The post.cz mail servers enforce recipient verification and reject invalid addresses. The domain does not function as catch-all. Rate limiting applies.
For delivery to post.cz, authenticate with SPF and DKIM. Follow the same practices as for seznam.cz. Comply with EU anti-spam regulations.
Upload a CSV or TXT list of Post.cz addresses to the bulk email verifier. Every address runs through a live SMTP handshake plus catch-all, role-account and disposable detection, and you download a clean list when processing completes. For real-time checks at signup, use the real-time email verification API.
CSV or TXT with one email per line. No formatting needed.
Each Post.cz address is checked with a live server handshake.
Get a verified list with status codes, risk flags, and catch-all detection.
Pay as you go. No subscriptions, and credits never expire.
Everything about verifying email at this domain.
Yes, post.cz is a valid free email domain operated by Seznam.cz. It provides permanent email accounts to users.
No, post.cz is not a disposable or temporary email provider. It offers permanent email accounts with standard email features.
post.cz uses mail servers operated by Seznam.cz. Check the MX records section above for specific server details.
Yes, with proper opt-in consent. Follow email best practices and ensure SPF, DKIM, and DMARC authentication is configured for your sending domain.
Use BulkEmailChecker to verify post.cz addresses via SMTP checks. Verification behavior varies by provider. Our tool handles provider-specific rate limiting automatically.
Upload a CSV or TXT list to the bulk email verifier. Every address runs through 30+ checks including SMTP existence, catch-all detection, role-account, and disposable matching. Processing time depends on list size.
99.7% accurate using a direct SMTP handshake with post.cz's mail servers, the same engine that has verified billions of addresses since 2012.
Other free email provider domains we have audited.