mailbox.org - Email Domain Verification & Deliverability Report

Active Free Email Provider
Organization: Heinlein Support GmbH
Mail Server: mailbox.org
Verified 1 days ago

Real-time verification data for Heinlein Support GmbH (mailbox.org). A Free Email Provider .

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MX Records for mailbox.org

PriorityMail ServerIP Address
10 mx1.mailbox.org 80.241.60.212
10 mx2.mailbox.org 80.241.60.215
20 mx3.mailbox.org 80.241.60.216
50 mx-n.mailbox.org 91.198.250.17
SMTP Status: Responding
SMTP Banner:
220 mx1.mailbox.org ESMTP Postfix

mailbox.org uses mailbox.org mail servers, which means emails are processed through mailbox.org infrastructure with their built-in spam filtering and security controls.

Email Authentication for mailbox.org

SPF Record Pass

v=spf1 ip4:213.203.238.0/25 ip4:195.10.208.0/24 ip4:91.198.250.0/24 ip4:80.241.56.0/21 ip6:2001:67c:2050::/48 mx ~all

SPF (Sender Policy Framework) specifies which mail servers are authorized to send email on behalf of mailbox.org.

DMARC Record Reject

v=DMARC1; p=reject; adkim=r; aspf=r; pct=100; rua=mailto:abuse+arf@heinlein-support.de; rf=afrf; fo=1;

Policy applied to: 100% of emails

DMARC (Domain-based Message Authentication) tells receiving servers what to do with emails that fail authentication checks.

DKIM Not Detected

DKIM detection is limited from external scanning. The domain may use DKIM with selectors not covered by our scan.

Authentication Summary: mailbox.org has SPF and DMARC configured. This provides good protection against email spoofing. Senders can expect reliable email delivery to this domain.

WHOIS & Domain Information

Registration Details

Domain
mailbox.org
TLD
.org
Created
2014-01-06
Updated
2025-09-06
Expires
2026-09-21
Domain Age
27 years

Registrar

Name
CPS-Datensysteme GmbH
IANA ID
1239

Registrant Contact

Name
REDACTED FOR PRIVACY
Organization
REDACTED FOR PRIVACY
Location
REDACTED FOR PRIVACY, Berlin, GERMANY

Technical Contact

Name
REDACTED FOR PRIVACY
Organization
REDACTED FOR PRIVACY
Location
REDACTED FOR PRIVACY, REDACTED FOR PRIVACY, UNITED STATES

Name Servers

  • dns3.cloudns.net
  • dns4.cloudns.net
  • ns.jpberlin.de
  • ns2.jpberlin.de
  • ns3.jpberlin.de

About mailbox.org Email Verification

mailbox.org is a German privacy-focused email service operated by Heinlein Support GmbH, based in Berlin. The service offers paid email accounts with strong encryption, calendar, contacts, cloud storage, and video conferencing, all hosted in German data centers under strict privacy standards.

mailbox.org implements SPF, DKIM, and DMARC authentication. The service supports PGP encryption, uses German-hosted servers exclusively, and complies with German and EU GDPR data protection. Mailbox.org is certified by the BSI (German Federal Office for Information Security).

The mailbox.org mail servers enforce recipient verification and reject invalid addresses. The domain does not function as catch-all. Security-focused filtering protects the privacy-conscious user base.

For delivery to mailbox.org, authenticate with SPF, DKIM, and DMARC. Mailbox.org users are security-conscious. German providers apply strict filtering. Well-authenticated messages deliver reliably.

How to Verify mailbox.org Email Addresses

Need to check if an email address at mailbox.org actually exists before you send to it? BulkEmailChecker performs deep SMTP-level validation, connecting directly to mailbox.org's mail servers to confirm the mailbox is real, active, and able to receive your message. No test email is ever sent, so your sender reputation stays protected.

Verify a Single mailbox.org Email
Use BulkEmailChecker's free email verification tool to instantly validate any mailbox.org address. You'll get a complete deliverability report including mailbox existence, catch-all detection, disposable domain flagging, and risk scoring, all in under 3 seconds.

Verify a List of mailbox.org Emails in Bulk
Have a mailing list full of mailbox.org addresses? Upload your CSV or TXT file to BulkEmailChecker and verify thousands of email addresses in minutes. Our bulk verification engine runs 30+ checks per address including syntax validation, DNS resolution, SMTP handshake, and spam trap detection. Clean your list before every campaign to keep bounce rates below 2% and protect your sender score. See bulk pricing.

Verify mailbox.org Emails via API in Real-Time
Building a signup form, CRM integration, or lead capture system? BulkEmailChecker's real-time verification API validates mailbox.org email addresses at the point of entry, blocking invalid, disposable, and risky addresses before they enter your database. Integrate with a single API call and prevent bad data at the source.

Frequently Asked Questions

Yes, mailbox.org is a valid email domain operated by Heinlein Support GmbH in Berlin, Germany. It is a privacy-focused paid email service.
No, mailbox.org is a permanent paid email service with strong privacy protections under German law.
Mailbox.org operates its own mail servers in Germany with full encryption and privacy-focused infrastructure.
Yes, with consent and GDPR compliance. Mailbox.org users are privacy-conscious and expect transparent communication practices.
Mailbox.org addresses can be verified via SMTP. As a paid service, addresses are typically valid and actively maintained.
The fastest and most accurate way to verify a mailbox.org email address is to use BulkEmailChecker's free email verification tool. Simply enter the full email address and our system performs SMTP-level validation by connecting directly to mailbox.org's mail servers. You'll get instant results showing whether the mailbox exists, is deliverable, and is safe to send to, all without sending a single email.
Yes. BulkEmailChecker uses SMTP verification to check if a mailbox.org mailbox exists without ever delivering an email. Our system connects to the domain's mail server, performs an SMTP handshake, and queries the mail server to confirm whether the recipient address is valid. This process is completely invisible to the email recipient and does not affect your sender reputation.
Sending to invalid email addresses causes hard bounces, which directly damage your sender reputation. Internet Service Providers (ISPs) and email providers track your bounce rate, and if it exceeds 2%, your emails may start landing in spam folders or get blocked entirely. Verifying mailbox.org addresses with BulkEmailChecker before sending prevents bounces and keeps your deliverability high.
BulkEmailChecker's bulk verification service lets you upload a CSV or TXT file containing thousands of mailbox.org email addresses and verify them all at once. Each address goes through 30+ verification checks including syntax validation, DNS/MX lookup, SMTP verification, disposable domain detection, and spam trap identification. Results are typically ready within minutes and can be downloaded as a clean, verified list.
Email verification is the process of confirming that an email address is real, properly formatted, and capable of receiving messages. It matters because sending to invalid addresses causes bounces, damages your sender reputation, wastes marketing budget, and can get your sending IP blacklisted. BulkEmailChecker verifies addresses at the SMTP level, the most accurate method available, ensuring your emails reach real people.
MX (Mail Exchange) records are DNS entries that specify which mail servers are responsible for receiving email for a domain. When you send an email, your mail server looks up the recipient domain's MX records to find where to deliver the message. If a domain has no MX records, it cannot receive email. BulkEmailChecker checks MX records as part of every verification to confirm the domain is configured for email delivery.
A catch-all (or accept-all) domain is configured to accept email sent to any address at that domain, regardless of whether the specific mailbox exists. This makes it harder to verify individual addresses because the server always responds positively. BulkEmailChecker detects catch-all configurations and flags them in verification results so you can make informed decisions about sending to those addresses.
Yes. BulkEmailChecker offers a real-time email verification API that you can integrate into signup forms, CRM systems, lead capture tools, and any application that collects email addresses. The API validates addresses at the point of entry, blocking invalid, disposable, and risky emails before they enter your database. Integration takes just a single API call with response times under 3 seconds.

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