telmex.com

Readiness by lane

Green: telmex.com. Thin bar: Telecommunications & Internet peer median.

Priority fixes for telmex.com

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Harden

   DMARC policy enforces quarantine or reject

   Observed: The DMARC policy for telmex.com was p=none, which asks receivers to take no action on failing mail.

   Why it matters: An enforcing DMARC policy helps receiving mail systems reject email that falsely claims to come from your domain, a common route for phishing your customers.

   What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.

   59% of Telecommunications & Internet peers do this. Limit: Read from public DNS at the time of the check; records may have changed since.

   Guide: A Practical Website Health Check for Owners

2. Priority 2 · Accelerate

   Modern image formats in use

   Observed: The homepage had 52 images and none used WebP or AVIF.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   52% of Telecommunications & Internet peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

3. Priority 3 · Enable

   Meta description written

   Observed: The homepage had no meta description.

   What to do: Write a short, specific description of the page for people, not a list of keywords.

   91% of Telecommunications & Internet peers do this.

   Guide: Meta Titles and Descriptions That Match Search Intent

4. Priority 4 · Accelerate

   Static files cached for 30 days or more

   Observed: A same-site stylesheet or script was cacheable for 1 days, short of the 30-day benchmark.

   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.

   41% of Telecommunications & Internet peers do this.

   Guide: Browser Caching Guide for Website Owners

What telmex.com already does well

Practices fewer than half of Telecommunications & Internet peers use.

• CAA records limit who can issue certificatesCAA limits issuance to amazon.com, comodoca.com, digicert.com and others.15% of peers
• No render-blocking scripts in <head>Head scripts load without blocking.37% of peers
• Content Security Policy presentContent-Security-Policy present.48% of peers

What we saw

Homepage checked

https://telmex.com/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

DigiCert, 198-day validity, expiring 2027-04-18

DNS operators

1 self-run or other nameserver domain

HSTS

max-age 365 days, includeSubDomains

DMARC policy

p=none

Homepage HTML

335 KB, gzip

Images on homepage

52 (jpg 26, png 13)

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

Compare with other Telecommunications & Internet sites

• a1.hr58
• im3.id59
• myt.mu58
• softbank.jp59
• te.eg59

Telecommunications & Internet readiness benchmark