What powers 
mailtester.com?
Last seen Sep 2026 · 26 technologies across 16 categories
Advertising Networks
Analytics
CDN
Development
Font scripts
JavaScript frameworks
JavaScript libraries
Live chat
Miscellaneous
PaaS
Performance
Programming languages
Tag managers
UI frameworks
Web Servers
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Oct 2026.
- robots.txt found
- llms.txt found
- ai.txt not found
- Oct 2026 *: Restricted (was Allowed)
- Sep 2026 *: Allowed (was Restricted)
- Sep 2026 llms.txt appeared
- Sep 2026 *: Restricted (was Allowed)
- Aug 2026 llms.txt removed
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| mailtester | #2 | 210 |
| email verification tool | #49 | 25 |
| mail-tester | #2 | 21 |
| mailtester spam | #2 | 11 |
| free email verifier | #47 | 9 |
| free email verifier | #47 | 9 |
| mail tester | #73 | 7 |
| email tester | #21 | 6 |
| test email blacklist | #56 | 5 |
| email tester com | #2 | 5 |
| mailtester | #18 | 4 |
| email list checker | #63 | 4 |
| bulk email verifier | #42 | 3 |
| bulk email checker | #41 | 3 |
| verify email address free | #59 | 3 |
| mailtester | #92 | 3 |
| mailtester | #54 | 3 |
| mailtester | #44 | 3 |
| free email checker | #61 | 3 |
| test email deliverability | #52 | 2 |
| test email address | #76 | 2 |
| verify email address validity | #86 | 2 |
| scam email checker | #76 | 2 |
| is this email legit | #87 | 2 |
| legit email checker | #53 | 2 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 80% desktop
- 20% phone
India
Germany
United Kingdom
France
United States
Türkiye
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.19 / 10 · ranked #229,879 of all domains
219 referring domains · OpenPageRank
Search traffic
380 est. monthly organic visits (US)
277 keywords in Google's top 30
Core Web Vitals
| LCP | 1.6 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 1100 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- CDN: Cloudflare
- Weight: 0.3 MB · 34 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- MailTester
- Industry: Software and apps (declares
SoftwareApplication)
From the homepage's own structured data (Sep 2026).
Infrastructure
- Registered Jun 2000 (26 years) via GoDaddy.com, LLC, renews Jun 2027
- Hosted on Cloudflare (104.21.53.192, IPv6)
- DNS: Cloudflare DNS
- Email: edustria.be
- Email security: SPF (soft fail), no DMARC record
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Nov 2026
- Common Crawl link graph: rank 1,200,128, 3 hosts
- Verified with: Google
DNS records as swept Oct 2026, certificate as seen Oct 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| mailtester.com | 16 |
| app.mailtester.com | 14 |
| www.mailtester.com | 5 |
Full technology history →
Report an incorrect detection
Recent changes
- detected PostHog Sep 2026
- dropped Apache HTTP Server Aug 2026
- dropped Bootstrap Aug 2026
- dropped Chart.js Aug 2026
- dropped Google Hosted Libraries Aug 2026
- dropped Hotjar Aug 2026
- dropped jQuery Aug 2026
- dropped jQuery UI Aug 2026
- dropped Mixpanel Aug 2026
- dropped Modernizr Aug 2026
- dropped Popper Aug 2026
- detected Next.js Jul 2026
- detected Next.js App Router Jul 2026
- detected Node.js Jul 2026
- detected Priority Hints Jul 2026
- detected Radix UI Jul 2026
- detected React Jul 2026
- detected Tailwind CSS Jul 2026
- detected Turbopack Jul 2026
- detected Webpack Jul 2026
- detected Cloudflare Browser Insights Nov 2025