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mailbox.org

https://mailbox.org· First analyzed 28 Apr 2026· Updated 28 Apr 2026
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mailbox.org
Desktop screenshot of mailbox.org
Mobile screenshot of mailbox.org
Mobile

Sponsored

Hosting Provider

Heinlein Services

IP Address

185.97.174.35

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Berlin, Germany

ASN

AS199118

Organization

Heinlein Services

Server

Apache

Nameservers

dns3.cloudns.net.ns.jpberlin.de.ns3.jpberlin.de.ns2.jpberlin.de.+1 more

Performance

99

Core Web Vitals

Weight

First Contentful Paint
722 ms10%
Speed Index
939 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.7 MB
123 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Web Servers

1
Apache

SEO Analysis

B78/100
23
4
0
Meta Tags14/15
Content11/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images6/7
Links5/5
URL5/5
Social2/5
Freshness2/4
Mobile4/4
Indexability3/3
M
mailbox.orgmailbox.org

mailbox Suite for individuals and businesses

Your digital workspace with email, cloud, office & meet. Secure & GDPR-compliant for businesses, public authorities and private individuals. ▶ Try us now!

Title Length44 chars

Recommended: 50-60 chars (~258px / 580px)

Description Length154 chars

Recommended: 120-160 chars

Issues (0)

    4 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    53 rules

    Local SEO

    Local Search Readiness

    10/100
    Poor
    3 13 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    D47/100
    Bot Access
    20/25
    Machine Read.
    13/25
    Schema Data
    0/25
    Citation
    14/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    navheader/footer
    Text ratio:5%
    Words:1,000
    Token eff.:Optimal
    Sections/1K:27
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary15w
    Descriptive Headingsavg 4.9w
    Canonical URL
    Open Graph2/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (9)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    A
    86/100
    13
    Passed
    1
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    20/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    10/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    6/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    49/100
    D
    218 mg
    CO₂e / view
    1.7 MB
    Page Weight
    60%
    Cleaner Than
    New Visitor
    250 mg
    vs
    Returning (cached)
    125 mg
    Annual (10K/mo)
    26.2 kg
    Emission Segments
    Data Center
    49 mg
    Network
    52 mg
    Device
    117 mg
    Resource Breakdown
    JavaScript
    16.0 KB
    Images
    549.0 KB
    CSS
    61.9 KB
    Fonts
    102.2 KB
    HTML
    16.3 KB
    Other
    1020.7 KB
    Green Hosting Not Verified
    Heinlein Services
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    76%Good
    Interactive

    HTTPS

    No WAF

    43d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    DigiCert Inc

    Key Algorithm

    RSA (4096 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    13.05.2025

    Valid Until

    10.06.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    *.mailbox.orgmailbox.org

    SHA-256 Fingerprint

    68:A2:7F:14:D4:D6:48:5F:4E:7B:A2:22:AA:AF:62:97:C2:49:74:EE...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    content-encoding
    📦 Gzip(gzip)
    content-length
    16409
    content-security-policy
    default-src 'self'; script-src 'self' https://numbers.mailbo...
    content-type
    text/html
    date
    Tue, 28 Apr 2026 14:03:56 GMT
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    70

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    MX Records (4)

    mx3.mailbox.org
    mx2.mailbox.org
    mx1.mailbox.org
    mx-n.mailbox.org

    Domain Information

    mailbox.org

    Domain Age
    27y 7m

    Created

    23.09.1998

    Expires

    22.09.2026

    Last Updated

    12.09.2025

    Registrar

    CPS-Datensysteme GmbH

    DNSSEC
    Not Enabled

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    C
    67/100
    Mobile Friendly1 breakpoint
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width, initial-scale=1.0
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    panton + blockicons

    WCAG Partial
    76/100
    Readability
    /30
    24/30

    18px · LH 1.35

    Hierarchy
    /20
    17/20

    3.56x ratio · ✓ H1→H6

    WCAG
    /25
    19/25

    1:1 min contrast

    Performance
    /25
    16/25

    2 fonts · 17 req

    Heading Font

    panton

    Sans64px

    Body Font

    blockicons

    Sans18px

    Contrast Ratio

    1:1

    1 issue

    Reading Comfort

    ~36 CPL

    Narrow lines
    64px
    h1
    46px
    h2
    24px
    h3
    18px
    p

    ✅ Excellent readability: 18px body text is ideal for all devices.

    ⚠️ Tight line spacing (1.35). Increase to 1.4–1.6 for better readability.

    ⚠️ Hard to read: Flesch score 35/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Strong hierarchy: Headlines are 3.6x larger than body text.

    Buy on MyFontsFlesch 35

    Color Palette

    12 unique colors
    Light
    #e7e7f0
    Secondary· 19.5%
    #fefefd
    Primary· 15.2%
    #19353f
    Primary· 0%
    #c0ec82
    Accent· 8.799999999999999%
    #aee760
    Primary· 7.9%
    #2c1b17
    Secondary· 7%
    #d6f2b0
    Accent· 6.4%
    #e3f7c8
    Accent· 6.3%

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    30 Resources

    20
    Scripts
    10
    Styles
    1
    Async
    0
    Defer

    Top Script Sources

    local(19)numbers.mailbox.org(1)

    Website Identity

    mailbox.org

    27 years old
    Location detected: 🇩🇪 Germanyvia ip
    CPS-Datensysteme GmbHen

    Social Profiles

    LinkedInBluesky

    Sponsored

    Last analyzed: 28 Apr 2026 at 14:04

    Historical Analysis & Change Tracking