webtelemetry.dev
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Technology · Libraries

Mailcheck

Not part of a site's own stack, so it is counted separately from what sites are built with.

Websites255working, as of their last visit
Found this week255first seen in the last 7 days
New launches10domains registered in the last 30 days
Over time

New websites using Mailcheck, per day

Websites first seen each day. The line starts on the first day of data.

Not enough history yet: trends appear once there are at least two days of data.

Cite

Cite this figure

webtelemetry.dev. (2026). New websites using Mailcheck, per day [Data set]. Retrieved September 28, 2026, from https://webtelemetry.dev/tech/mailcheck#fig-new-websites-using-mailcheck-per-day

Figures as of 28 September 2026, 18:17 UTC. They change as new sites are checked, so keep the date with them. Link to this figure

Hosting

Where they are hosted

United States 32
France 12
Germany 9
Israel 5
Brazil 5
Spain 4
Netherlands 4
Italy 4
Server country. Sites behind a CDN have no single location
Cite

Cite this figure

webtelemetry.dev. (2026). Where they are hosted [Data set]. Retrieved September 28, 2026, from https://webtelemetry.dev/tech/mailcheck#fig-where-they-are-hosted

Figures as of 28 September 2026, 18:17 UTC. They change as new sites are checked, so keep the date with them. Link to this figure

Stack

Often used alongside Mailcheck

jQuery 100.0%
PHP 95.7%
WordPress 93.3%
MySQL 93.3%
jQuery Migrate 81.6%
punycode 78.0%
Cloudflare 65.9%
Yoast SEO 61.6%
Google Analytics 60.8%
Google Font API 54.5%
Share of these websites that also use each, from a sample of up to 200,000 sites
Cite

Cite this figure

webtelemetry.dev. (2026). Often used alongside Mailcheck [Data set]. Retrieved September 28, 2026, from https://webtelemetry.dev/tech/mailcheck#fig-often-used-alongside-mailcheck

Figures as of 28 September 2026, 18:17 UTC. They change as new sites are checked, so keep the date with them. Link to this figure

Recently seen websites using Mailcheck