post-online.dk is a free email provider

post-online.dk is a consumer mailbox provider, so anyone can open an address there in a minute.

Free provider

82 /100

Strong

Email authentication report card

What post-online.dk publishes in DNS to stop other people sending mail in its name, read record by record.

3 pass 2 weak

Can mail be forged as this domain?

A forgery is sent to spam, not the inbox

DMARC is set to p=quarantine and enforced on every message, so a receiver that honours it does not reject a forgery outright but files it in spam rather than the inbox. Moving to p=reject would drop it entirely.

  • Pass

    SPF -all

    The record ends in -all, so a receiver is told to treat mail from any host outside the list as a forgery.

  • Pass

    DMARC p=quarantine

    Receivers are asked to send failing mail to spam rather than the inbox.

  • 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 82?

  1. DMARC is published and enforced, so forged mail is rejected or quarantined.
  2. Accepts mail through 1 MX host.
  3. SPF ends in -all, so mail from any other server is rejected.

What to publish to close the gaps

The records post-online.dk 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. Raise DMARC to p=reject

    Name_dmarc.post-online.dk
    TypeTXT
    Valuev=DMARC1; p=reject; pct=100; rua=mailto:[email protected]

    Quarantine sends forgeries to spam, where people still find them. Reject stops delivery.

  2. Publish an MTA-STS policy

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

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

  3. Publish a TLS reporting address

    Name_smtp._tls.post-online.dk
    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 post-online.dk

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

Is post-online.dk a disposable email domain?
No. post-online.dk is a consumer mailbox provider, so addresses are permanent, but anyone can open one in a minute.
Is post-online.dk spoofable?
A forgery is sent to spam, not the inbox. DMARC is set to p=quarantine and enforced on every message, so a receiver that honours it does not reject a forgery outright but files it in spam rather than the inbox. Moving to p=reject would drop it entirely.
Does post-online.dk publish SPF and DMARC?
post-online.dk publishes an SPF record that ends in -all, the strict form. DMARC is published and enforced, so a failing message is rejected or quarantined.
Who handles email for post-online.dk?
We have not matched the mail hosts for post-online.dk to a platform we track, so we do not name one. The hostnames themselves are available with an API key.
How old is the post-online.dk domain?
The registry for .dk does not publish a registration date we can read, so we do not state an age.
How do I block post-online.dk on my signup form?
We do not classify post-online.dk 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 post-online.dk?
post-online.dk scores 82 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.