Is post.cz a valid email domain?
post.cz has working mail routing: 2 MX records pointing, led by mx1.seznam.cz.
It is a free, public mailbox provider, and it is not on our disposable list.
SPF is published and ends with ?all. DMARC is set to none.
Check an email address at post.cz
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MX records
| Priority | Mail server | Resolves to |
|---|---|---|
| 5 | mx1.seznam.cz | 77.75.77.90, 2a02:598:2::1090 |
| 10 | mx2.seznam.cz | 77.75.77.42, 2a02:598:2::1042 |
SPF
Record published
v=spf1 mx ip4:77.75.78.0/23 ip4:77.75.76.0/23 ip6:2a02:598::/32 ?all
DMARC
Policy: none
v=DMARC1; p=none; rua=mailto:abuse@seznam.cz; fo=d; ruf=mailto:abuse@seznam.cz
Disposable?
No, not on our disposable list.
Free provider?
Yes, a free public mailbox provider.
What this means for your email list
Is a free-provider address a problem?
Not by itself. post.cz is a normal mailbox provider used by real people, and mail to it is delivered reliably. The thing to watch is whether the specific mailbox exists, which a domain check cannot tell you, so verify each address.
Sender authentication
post.cz has DMARC in monitoring mode (p=none). It collects reports but does not yet block spoofed mail, so the domain is easier to impersonate.
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Sign up to get a report summary →Frequently asked questions
- Is post.cz a valid email domain?
- Yes. post.cz publishes 2 MX records and can receive email. Whether a particular mailbox exists is a separate question that only a mailbox check can answer.
- Is post.cz a disposable email domain?
- No. post.cz is not on our disposable list, but it is a free public provider. The list is updated regularly, and new throwaway domains appear all the time.
- What are the MX records for post.cz?
- mx1.seznam.cz (priority 5); mx2.seznam.cz (priority 10).
- Does post.cz have SPF and DMARC?
- SPF: yes, ending ?all. DMARC: yes, policy none.