email.cz is a free email provider

email.cz is a major consumer mailbox provider. Anyone can open an address, and at this scale a forged message is usually caught by the provider even where the domain's own records would let it through.

Major provider Spoofable

90 /100

Strong

Email authentication report card

What email.cz publishes in DNS to stop other people sending mail in its name, read record by record.

1 pass 4 weak

Can mail be forged as this domain?

Yes on paper, but unlikely to land

DMARC is set to p=none, which only asks for reports, so nothing this domain publishes tells a receiver to reject a forged message. In practice a forgery will still be caught: a provider this size runs its own reputation and content filtering on top of what the domain publishes. That safety net is the provider's, not the domain's.

  • Weak

    SPF ?all

    The record ends in ?all, which asserts nothing at all about senders outside the list.

  • Weak

    DMARC p=none

    A DMARC record is published, but p=none only asks for reports. Receivers are told to deliver failing mail anyway, so this stops no forgery.

    A checker that reports "DMARC found" here is telling you nothing useful.

  • Weak

    MTA-STS Not published

    No MTA-STS policy, so a sending server has nothing that tells it to insist on verified TLS for this domain.

  • Pass

    DNSSEC Signed

    The zone is signed, so the MX, SPF and DMARC answers above cannot be quietly rewritten in transit.

  • Weak

    TLS-RPT Not published

    No reporting address, so failed TLS deliveries to this domain go unnoticed by its owner.

Why it scores 90?

  1. Registered more than five years ago.
  2. Accepts mail through 2 MX hosts.
  3. Mail is handled by a mailbox provider we recognize.

What to publish to close the gaps

The records email.cz is missing, in the order they are worth doing. Owner names are written out in full, so they work whether your DNS panel wants a full name or a relative one.

  1. Tighten SPF to -all

    Nameemail.cz
    TypeTXT
    Valuev=spf1 <your existing mechanisms> -all

    Keep the mechanisms you already have and change the final qualifier. Anything softer leaves the forgery path open.

  2. Move DMARC off p=none

    Name_dmarc.email.cz
    TypeTXT
    Valuev=DMARC1; p=quarantine; pct=100; rua=mailto:[email protected]

    p=none blocks nothing. Once your reports show every legitimate sender passing, raise the policy to quarantine and then to reject.

  3. Publish an MTA-STS policy

    Name_mta-sts.email.cz
    TypeTXT
    Valuev=STSv1; id=<a version string you bump on every change>

    Serve the policy body at https://mta-sts.email.cz/.well-known/mta-sts.txt, start it in testing mode, then switch it to enforce so senders refuse to deliver over an unverified connection.

  4. Publish a TLS reporting address

    Name_smtp._tls.email.cz
    TypeTXT
    Valuev=TLSRPTv1; rua=mailto:[email protected]

    Without it, a sending server that could not negotiate TLS with your mail hosts has nowhere to tell you.

Questions about email.cz

Every answer below is generated from the stored record for this domain.

Is email.cz a disposable email domain?
No. email.cz is a consumer mailbox provider, so addresses are permanent, but anyone can open one in a minute.
Is email.cz spoofable?
Yes on paper, but unlikely to land. DMARC is set to p=none, which only asks for reports, so nothing this domain publishes tells a receiver to reject a forged message. In practice a forgery will still be caught: a provider this size runs its own reputation and content filtering on top of what the domain publishes. That safety net is the provider's, not the domain's.
Does email.cz publish SPF and DMARC?
email.cz publishes an SPF record, though it does not end in -all, so hosts outside the list are not treated as forgeries. DMARC is published but set to p=none, which only asks for reports. It looks like protection and is not.
Who handles email for email.cz?
Mail for email.cz is handled by Seznam.cz, which carries 2 other domains we track.
How old is the email.cz domain?
The email.cz domain was registered 28 years ago.
How do I block email.cz on my signup form?
We do not classify email.cz as disposable, so blocking it outright would turn away real people. If you want to act on it, decide on the signals listed above rather than the name.
Can I trust email from email.cz?
email.cz scores 90 out of 100, which is a strong band. The score is a summary of the classification, infrastructure, authentication, reputation and lifecycle signals we hold, not a judgment about any individual sender at that domain.

Last verified . We recheck every domain on a schedule, and this report changes only when its records or its verdict do.