post.cz website report
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Last scanned · 1 view
Overall score
Great
About post.cz
login.seznam.cz is a website. It describes itself as “Přihlášením do jednoho účtu můžete používat vše od Seznamu”.
Score profile
Top issues to fix
8 issues found
2 cookies without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
Multiple H1 headings found
SEOKeep a single H1 per page and demote the others to H2/H3.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
+2 more issues — details in the sections below.
How it compares
post.cz scores higher overall than 70% of the 163,243 sites we have scanned.
vs. All scanned sites
163,243 sitesThe dot is this site; the tick is the typical (median) score for the group. The number on the right is the percentile: the share of the group this site scores above.
Technology stack
post.cz is built with Nginx.
Servers (1)
Hosting & DNS
- IP address
- 77.75.78.104
- ASN
- AS43037
- IPv6
- Supported
- HTTP
- HTTP/1.1
Show DNS record values
- A
- 77.75.78.104
- AAAA
- 2a02:598:a::78:104
- CNAME
- login.szn.cz
TXT record contents are not republished; only their count is shown.
Security
post.cz uses TLS 1.3 with a certificate valid for 47 more days and sets 4 of 6 recommended security headers.
Security headers4 of 6 set
- HSTSForces HTTPS
- CSPBlocks injected scripts
- X-Frame-OptionsStops clickjacking
- X-Content-TypeStops MIME sniffing
- Referrer-PolicyLimits URL leakage
- Permissions-PolicyRestricts browser features
TLS certificate
- Names covered
- 1
- Cookies set
- 3
Email security
post.cz scores F for email security, with SPF and DMARC policy “none”.
- SPFWeak
Neutral policy; unlisted senders are neither trusted nor rejected.
- DMARCWeak
Monitoring only: forged mail is still delivered.
- MTA-STSNot set
Not published; mail to this domain can be downgraded to plaintext.
- BIMINot set
Not published (optional).
Performance & carbon
post.cz scores 100/100 for performance, with an estimated load time of 0.5 s. A visit emits an estimated 0.21 g of CO2 (grade B).
Page weight
- HTML 46.5 KB
- JavaScript 492 KB
- CSS 34.7 KB
- Est. load
- 454 ms
- Response
- 454 ms
- Scripts / CSS
- 4 / 1
Carbon per visitB
0.21 g CO2 per uncached view
Estimate from the Sustainable Web Design model. HTML, JavaScript and CSS only; images, video and fonts are not measured. Treat it as a lower bound for comparing pages, not an audit.
SEO & accessibility
post.cz scores 70/100 for SEO and 75/100 for accessibility, with 5 SEO issues to fix.
Heading structure
25 H1s; one is the convention.
Image alt text
45 images · 21 without alt text · 0 lazy-loaded
Links
- Internal 2
- External 11
SEO issues5
- Missing canonical link
- Multiple H1 headings found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- sitemap.xml not found
Accessibility issues2
- More than 20% of images are missing alt text
- Missing <html lang> attribute
Technical details
Page metadata, social tags, crawl files and scan information.
Meta tags
- Title
- Log in
- Description
- Přihlášením do jednoho účtu můžete používat vše od Seznamu. Email, Mapy, Sreality, Stream, firemní profil Seznam naplno a mnohem víc.
- Canonical
- Language
- Robots meta
Crawl files
- robots.txt
- Found
- Disallow rules
- 2
- sitemap.xml
- Not found
- URLs in sitemap
- 0
Structured data
No JSON-LD types declared.
- Microdata items
- 0
- RDFa items
- 0
Scan
- Final URL
- https://login.seznam.cz/?returnURL=https%3a%2f%2femail.seznam.cz%2f&serviceId=email
- HTTP status
- 200
- Redirects
- https://post.cz → https://email.seznam.cz/ → https://login.seznam.cz/?returnURL=https%3a%2f%2femail.seznam.cz%2f&serviceId=email
- Scanned
- Aug 24, 2026, 1:22 PM
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Frequently asked questions about post.cz
- What is post.cz?
- login.seznam.cz is a website. It describes itself as “Přihlášením do jednoho účtu můžete používat vše od Seznamu”.
- What technology does post.cz use?
- post.cz is built with Nginx.
- Is post.cz secure?
- post.cz uses TLS 1.3 with a certificate valid for 47 more days and sets 4 of 6 recommended security headers.
- Is post.cz protected against email spoofing?
- post.cz scores F for email security, with SPF and DMARC policy “none”.
- How does post.cz compare with similar sites?
- post.cz scores higher overall than 70% of the 163,243 sites we have scanned.
- What is post.cz's overall score?
- post.cz has an overall SiteGraph score of 86/100, combining SEO (70), performance (100), security (100) and accessibility (75).
Open Graph & Twitter