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IONOS – where your security matters

The security of our services and applications is a top priority for us. That’s why we want to give you the chance to report vulnerabilities you encounter in our products.

What should I do if...?

Do you think your account has been hacked or your IONOS details have been stolen? Even if it’s just a hunch, learn more about immediate measures you can take, tips for secure passwords and what you can do against online threats in our Help Centre.

To reduce the number of unwanted marketing emails in your inbox, IONOS offers you a range of options. Detailed information about the configuration of our spam filters, as well as information on the tricks of those who send spam can be found on our Help Centre under the Email Security section.

Have you received an email from IONOS but doubt its authenticity? You can find tips on how to verify emails from IONOS, how to deal with phishing emails and how to report phishing sites in our article in the Help Centre.

General information about online security can be found in other Help Centre articles.

If you’ve found indications of vulnerabilities in one of our products or server configurations, please send us the information directly. It would be really helpful if you could describe the vulnerability you found in as much detail as possible, and include information like:

  • Who is affected by the threat? If possible, provide the affected URLs.
  • How can the vulnerability be exploited? It may be helpful to include screenshots to illustrate the vulnerability.
  • Please also provide the relevant details needed to reproduce the described steps. Note: do not include sensitive data, such as your password, in your description, and send to our contact address ( You can use our GPG key to send us the information confidentially.

Key-Id: 4428 221C D8B4 FE3E

Fingerprint: 2274 2D06 DB30 8D50 5E12 7AE5 4428 221C D8B4 FE3E

For all other queries, please contact our customer service team directly.