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VaultSandbox | Production-Like Email Testing. Self-Hosted & Secure. — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Email →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
velocitymail.io ↗	66 match 1 shared topics	Velocity Mail - Email Testing and Deliverability Tools	en	email	robotsllmsaihumans	emailphone	partial · 8
nexmail.app ↗	66 match 1 shared topics	NexMail - Modern Webmail for Self-Hosted Mail Servers	en	email	robotsllmsaihumans	emailphone	partial · 8
bumail.space ↗	66 match 1 shared topics	Self-Hosted Email Marketing Platform - MailPurse	en	email	robotsllmsaihumans	emailphone	partial · 8
mcstock.org ↗	66 match 1 shared topics	Sustainable, Private & Secure Email \| Runbox	en	email WordPress WooCommerce	robots llmsaihumans	emailphone	none
booboo.blue ↗	66 match 1 shared topics	Private Email Hosting \| Secure Business Email with Custom Domain	en	email	robotsllmsaihumans	emailphone	none
jellymail.org ↗	66 match 1 shared topics	Private Email Hosting \| Secure Business Email with Custom Domain	en	email	robotsllmsaihumans	emailphone	none
nextdayemail.com ↗	66 match 1 shared topics	NextDayEmail \| Professional Business Email Hosting	en	email	robotsllmsaihumans	emailphone	none
nichewares.com ↗	66 match 1 shared topics	Private Email Hosting \| Secure Business Email with Custom Domain	en	email	robotsllmsaihumans	emailphone	none
owlmail.com.au ↗	65 match 1 shared topics	Cheap Email Hosting Australia \| Business Email from $2/mo	Australia en	email WordPress	robots llmsaihumans	emailphone	none
brandymail.com ↗	65 match 1 shared topics	Verified & Common Mark Certificates for Email Trust & Security \| Brandymail	en	email	robotsllmsaihumans	email phone	none
4email.com ↗	65 match 1 shared topics	4Email -- Search Engine for Email Products, Services, and Information	en	email	robotsllmsaihumans	emailphone	none
1tempmail.com ↗	65 match 1 shared topics	1TempMail - Instant, Secure & Free Disposable Temporary Email	en	email	robotsllmsaihumans	emailphone	none
gmx.co ↗	65 match 1 shared topics	Free Email Accounts @GMX.com: Secure & easy to use	Colombia en	email	robotsllmsaihumans	emailphone	none
4inbox.info ↗	65 match 1 shared topics	Free Email Accounts @GMX.com: Secure & easy to use	en	email	robotsllmsaihumans	emailphone	none
dotselah.com ↗	65 match 1 shared topics	HostingBeats - Email Marketing That Converts	en	email	robotsllmsaihumans	emailphone	none
businessfinancing.sbs ↗	65 match 1 shared topics	Free Email Verification \| VeriMails	en	email	robotsllmsaihumans	emailphone	none
360inbox.com ↗	65 match 1 shared topics	360Inbox - Email Deliverability & CRM Solutions	en	email	robots llmsaihumans	emailphone	none
blimp.email ↗	65 match 1 shared topics	Blimp - The Secure, Fast, and Beautiful Email Client	en	email	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.