Website readiness profile · Snapshot 23 October 2026
gmx.net
gmx.net's public homepage, certificate and DNS checked against 31 practices and compared with 33 Webmail & Message Inboxes sites.
- Readiness index
- 77/100
- Ahead of
- 79%
- Practices observed
- 22/31
- Popularity band
- Top 5K
Webmail & Message Inboxes median 64
of measured Webmail & Message Inboxes sites
0 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: gmx.net. Thin bar: Webmail & Message Inboxes peer median.
Enable
67/100
Peers 60
Harden
95/100
Peers 67
Accelerate
63/100
Peers 54
Recover
0/100
Peers 19
Priority fixes for gmx.net
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
Static files cached for 30 days or more
Observed: A same-site stylesheet or script was cacheable for 2 seconds, short of the 30-day benchmark.
Why it matters: Returning visitors and later page views reuse cached files instead of downloading them again.
What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.
28% of Webmail & Message Inboxes peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.
Priority 2 · Enable
XML sitemap discoverable
Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.
What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.
33% of Webmail & Message Inboxes peers do this.
Guide: XML Sitemap Guide: Include Only URLs You Stand Behind
Priority 3 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 4 external scripts without async or defer.
What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.
30% of Webmail & Message Inboxes peers do this.
Guide: Control Third-Party Scripts Before They Control Your Page
Priority 4 · Harden
Certificate lifetime of 100 days or less
Observed: The certificate from Deutsche Telekom Security GmbH had a 197-day validity period, longer than the 100-day maximum that applies from March 2027.
What to do: Move to automated issuance and renewal now, while you still have time to test it.
38% of Webmail & Message Inboxes peers do this.
What gmx.net already does well
Practices fewer than half of Webmail & Message Inboxes peers use.
- security.txt publishedsecurity.txt with a contact found.20% of peers
- CAA records limit who can issue certificatesCAA limits issuance to digicert.com, sectigo.com, telesec.de.33% of peers
- DNSSEC signedDNSSEC delegation (DS record) present.39% of peers
What we saw
- Homepage checked
- https://www.gmx.net/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Deutsche Telekom Security GmbH, 197-day validity, expiring 2027-04-28
- DNS operators
- IONOS DNS
- HSTS
- max-age 365 days, includeSubDomains, preload
- DMARC policy
- p=quarantine
- Homepage HTML
- 322 KB, gzip
- Images on homepage
- 148 (webp 348, jpg 112, svg 22, png 14)
Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.
Stack and providers
Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.
All 31 checks
Select a gap for the method and fix. How each check works
Not observed 9
Observed 22
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- CAA records limit who can issue certificates
- DNSSEC signed
- security.txt published
- DMARC policy enforces quarantine or reject
- X-Content-Type-Options: nosniff
- Framing restricted
- Content Security Policy present
- Referrer-Policy set
- HTTP/2 negotiated
- HTML compressed
- Modern image formats in use
- Offscreen images lazy-loaded
- robots.txt published
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Page language declared
- At most one redirect to the homepage
Own gmx.net?
Re-run the checks after a change, keep a private action plan in a free workspace, or report a mistake.
Live status for this site: Status Is Down: gmx.net. This profile covers configuration only.