indexo.dev

clustermail.de

.de dns crawl

First seen 2026-05-01 · Last seen 2026-05-19 · ok HTTP/1.1 200 586 ms crawled 2026-05-08

DE · 212.223.74.94 · AS8741 ratiokontakt GmbH

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
Mailserver: Administration and Webmail
Language
de

Technology

Server
nginx

Registration

Updated
2018-01-26
Name servers
  • ns11.nameserver.de.
  • ns12.nameserver.de.

DNS records live

NS
  • ns11.nameserver.de
  • ns12.nameserver.de
MX
  • 10 mail.clustermail.de

Email authentication weak

SPF
not published
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

Sectigo Public Server Authentication CA DV R36
from 2025-10-31 to 2026-12-02
Expires in 196 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 70/100 Checked live page: https://clustermail.de/

present
  • strict-transport-security
  • x-frame-options
  • x-content-type-options
findings
  • missing Content Security Policy
  • missing Referrer Policy
  • missing Permissions Policy
Header values
x-frame-options
SAMEORIGIN
x-content-type-options
nosniff
strict-transport-security
max-age=15768000; includeSubdomains; preload

Linked from (1)