posteo.uk is a free email provider

posteo.uk is a consumer mailbox provider, so anyone can open an address there in a minute.

Free provider Spoofable

92 /100

Strong

Email authentication report card

What posteo.uk 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, a forgery is delivered

DMARC is set to p=none, which only asks for reports, so a receiver that honours what this domain publishes is not told to reject a message with it in the From header, and delivers it.

  • Weak

    SPF ~all

    The record ends in ~all. Mail from a host outside the list is only marked, not rejected, so it usually still arrives.

  • 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 testing

    A policy is published in testing mode. Failures are reported but delivery still goes ahead over an unverified connection.

  • 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 92?

  1. Registered more than five years ago.
  2. Accepts mail through 5 MX hosts.
  3. Mail is handled by a mailbox provider we recognize.

What to publish to close the gaps

The records posteo.uk 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

    Nameposteo.uk
    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.posteo.uk
    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. Switch MTA-STS to enforce

    Valuemode: enforce

    Change mode in https://mta-sts.posteo.uk/.well-known/mta-sts.txt and bump the id in the TXT record. Testing mode reports failures but still delivers.

  4. Publish a TLS reporting address

    Name_smtp._tls.posteo.uk
    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 posteo.uk

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

Is posteo.uk a disposable email domain?
No. posteo.uk is a consumer mailbox provider, so addresses are permanent, but anyone can open one in a minute.
Is posteo.uk spoofable?
Yes, a forgery is delivered. DMARC is set to p=none, which only asks for reports, so a receiver that honours what this domain publishes is not told to reject a message with it in the From header, and delivers it.
Does posteo.uk publish SPF and DMARC?
posteo.uk 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 posteo.uk?
Mail for posteo.uk is handled by Posteo, which carries 50 other domains we track.
How old is the posteo.uk domain?
The posteo.uk domain was registered 12 years ago. The registrar of record is INWX GmbH t/a INWX.
How do I block posteo.uk on my signup form?
We do not classify posteo.uk 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 posteo.uk?
posteo.uk scores 92 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.