gfz.de

Email infrastructure report · Last checked 28 Jul 2026, 16:11 UTC

Summary

gfz.de uses Self-hosted / Custom for email and has SPF, DKIM, and DMARC configured. It is not catch-all.

Mail provider

ProviderSelf-hosted / Custom self-hosted

Primary MXb1791.mx.srv.dfn.de

MX records

Priority	Hostname	IPs
10	b1791.mx.srv.dfn.de	194.95.234.122
10	a1791.mx.srv.dfn.de	194.95.232.122
10	c1791.mx.srv.dfn.de	194.95.238.122

Authentication

SPF✓ Present ~all

DKIM✓ Found (selectors: mail)

DMARC✓ Present p=quarantine

Raw SPF record

v=spf1 a:mail.gfz.de a:otc-de-spf.mms.t-systems-service.com a:gfz-potsdam.managed-otrs.com ~all

Raw DMARC record

v=DMARC1; p=quarantine;

Email behavior

Catch-all✗ No

Disposable✗ No

Free provider✗ No

STARTTLS✓ Supported

SMTP response5920ms

SMTP banner220-b1791.mx.srv.dfn.de ESMTP Postfix 220 b1791.mx.srv.dfn.de ESMTP Postfix

What this means

This domain has strong email authentication. Messages claiming to come from @gfz.de can be cryptographically verified by recipients, making spoofing difficult. Deliverability for legitimate mail should be good.

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