runbox.com is a free email provider

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

Free provider

100 /100

Strong

Email authentication report card

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

4 pass 1 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 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.

  • Pass

    TLS-RPT Published

    Sending servers have an address to report failed TLS deliveries to.

Why it scores 100?

  1. Registered more than five years ago.
  2. DMARC is published and enforced, so forged mail is rejected or quarantined.
  3. Accepts mail through 1 MX host.

What to publish to close the gaps

The records runbox.com 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.runbox.com
    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. Switch MTA-STS to enforce

    Valuemode: enforce

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

Questions about runbox.com

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

Is runbox.com a disposable email domain?
No. runbox.com is a consumer mailbox provider, so addresses are permanent, but anyone can open one in a minute.
Is runbox.com 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 runbox.com publish SPF and DMARC?
runbox.com 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 runbox.com?
We have not matched the mail hosts for runbox.com to a platform we track, so we do not name one. The hostnames themselves are available with an API key.
How old is the runbox.com domain?
The runbox.com domain was registered 27 years ago. The registrar of record is eNom, LLC.
How do I block runbox.com on my signup form?
We do not classify runbox.com 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 runbox.com?
runbox.com scores 100 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.