Holger D. Erbe
Responsible for the subject matter of the guides on SMTP, deliverability and DNS on this site.
Why there is a name here
A technical text without an author is hard to judge. With DNS records, error codes and legal deadlines, what matters is who stands behind a statement and when it was last reviewed. That is why every article in the guides section carries a byline, a publication date and a date of last review, and ends with the primary sources it is based on.
The articles grow out of the day-to-day operation of MailBridge, the SMTP relay of LOGIN SystemHaus GmbH. What shows up there in logs, bounces and support requests is the foundation. Where a text goes beyond our own operation, it names the source: the RFC, the vendor documentation or the text of the law.
What you will not find here
No certificates, no awards, no years-of-experience claims. Anything that cannot be verified does not belong on a page meant to establish trust. On legal topics, each article states explicitly that it provides general information only: LOGIN SystemHaus GmbH does not provide legal advice.