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KeepKnown | The Allow-List Email Filter for Gmail & Outlook — 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
vixamail.com ↗	65 match 2 shared topics	VixaMail — Secure Email Built for Privacy	en	information-and-network-security	robotsllmsaihumans	emailphone	partial · 8
4securemail.net ↗	65 match 2 shared topics	4SecureMail - Professional Secure Email for Business & Individuals	en	email	robotsllmsaihumans	emailphone	none
4securemail.com ↗	65 match 2 shared topics	4SecureMail - Professional Secure Email for Business & Individuals	en	email	robotsllmsaihumans	emailphone	none
7rash.com ↗	64 match 2 shared topics	7rash.com — Disposable Email for Privacy & Spam Protection	en	email	robotsllmsaihumans	emailphone	none
spydermail.com ↗	64 match 2 shared topics	SpyderMail - Managed Email Security	en	information-and-network-security	robots llmsaihumans	emailphone	none
everydaymail.net ↗	64 match 2 shared topics	Everydaymail \| Secure & Private Email Provider	en	email	robotsllmsaihumans	emailphone	partial · 8
sremmail.com ↗	64 match 2 shared topics	SremMail \| The Future of Secure Communication	en	email	robotsllmsaihumans	emailphone	partial · 8
batch365.com ↗	64 match 2 shared topics	Batch 365 Email Security for Microsoft \| Google \| Zoho	en	information-and-network-security	robotsllmsaihumans	emailphone	none
once-email.com ↗	64 match 2 shared topics	Once Email Protect Your Privacy - Free Disposable Email	en	email	robotsllmsaihumans	emailphone	none
cryptup.org ↗	64 match 2 shared topics	FlowCrypt: PGP Encryption for Gmail	en	information-and-network-security	robots llmsaihumans	emailphone	none
cryptup.net ↗	64 match 2 shared topics	FlowCrypt: PGP Encryption for Gmail	en	information-and-network-security	robots llmsaihumans	emailphone	none
1sec-mail.com ↗	64 match 2 shared topics	Temp Mail \| Online Disposable Email \| 1SecMail	en	email	robotsllmsaihumans	emailphone	none
crypto-mail.ch ↗	64 match 2 shared topics	Proton Mail: Get a free email account with privacy and encryption \| Proton	Switzerland en	information-and-network-security	robotsllmsaihumans	emailphone	none
fastdogmail.com ↗	64 match 2 shared topics	Proton Mail: Get a free email account with privacy and encryption \| Proton	en	information-and-network-security	robotsllmsaihumans	emailphone	none
dovecot.org ↗	64 match 2 shared topics	Dovecot \| The Secure IMAP server	en	information-and-network-security	robotsllmsaihumans	emailphone	none
darkwebemail.com ↗	64 match 2 shared topics	Best Dark Web Email Services - Dark Web Email	en	information-and-network-security WordPress WooCommerce	robotsllmsaihumans	emailphone	none
omnimailhub.com ↗	64 match 2 shared topics	OmniMailHub — One Login, All Your Email Accounts \| End-to-End Encrypted	en	information-and-network-security	robotsllmsaihumans	emailphone	partial · 8
death2spam.net ↗	63 match 2 shared topics	Death2Spam: Intelligent Email Control Systems	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.