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Winmail alternatives & similar sites

Letter Opener – Open winmail.dat files — 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 Software And Applications →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
mailenable.com ↗	55 match shared topic	Windows Mail Server, Email Server Software, Mail Servers \| MailEnable	en	email	robotsllmsaihumans	emailphone	partial · 1
smartertools.com ↗	55 match shared topic	SmarterTools \| SmarterMail Microsoft Exchange Alternative, Help Desk & Web Analytics	en	software-and-applications	robots llmsaihumans	emailphone	none
kxhs35.vip ↗	55 match shared topic	小黄书发布站	en	email	robotsllmsaihumans	emailphone	none
exim.org ↗	55 match shared topic	Exim Internet Mailer	en	email	robotsllmsaihumans	emailphone	none
list.org ↗	55 match shared topic	GNU Mailman	en	email	robotsllmsaihumans	emailphone	none
axigen.com ↗	55 match shared topic	Mail Server Software \| Axigen	en	email	robotsllmsaihumans	emailphone	none
mutt.org ↗	55 match shared topic	The Mutt E-Mail Client	en	email	robotsllmsaihumans	emailphone	none
exclaimer.com ↗	55 match shared topic	Exclaimer \| Email Signature Software for Microsoft 365, Exchange & Google	en	software-and-applications Storyblok	robots llmsaihumans	emailphone	none
mailu.io ↗	55 match shared topic	Mailu — Mailu, Docker based mail server	en	email	robotsllmsaihumans	emailphone	none
sendblaster.com ↗	55 match shared topic	Bulk email software - Mass email software \| SendBlaster	en	email WordPress	robotsllmsaihumans	emailphone	none
fastemailsender.com ↗	55 match shared topic	√ Fast Email Sender ® Bulk Email Sender Software.	en	email	robotsllmsaihumans	emailphone	none
fookes.com ↗	55 match shared topic	Fookes Software – Award-Winning Software from Switzerland	en	email	robotsllmsaihumans	emailphone	none
vimbadmin.net ↗	55 match shared topic	ViMbAdmin :: Virtual Mailbox Administration	en	email	robotsllmsaihumans	emailphone	none
waypointsoftware.io ↗	55 match shared topic	Lead Management & Email Verification Software \| Waypoint	en	email	robotsllmsaihumans	emailphone	none
zimbra.com ↗	40 match shared topic	Open Standards \| Low-Risk Alternative \| Data Sovereignty \| Zimbra	en	email WordPress	robotsllmsaihumans	emailphone	none
listmonk.app ↗	40 match shared topic	listmonk - Free and open source self-hosted newsletter, mailing list manager, and transactional mails	en	software-and-applications	robotsllmsaihumans	emailphone	none
egeria-project.org ↗	40 match shared topic	Egeria Project - Open metadata and governance for enterprises	en	software-and-applications WordPress	robotsllmsaihumans	emailphone	none
grahl-software.com ↗	40 match shared topic	Annotate, Edit and Comment PDF Files. Open any PDF file, add annotations and save all back to PDF in one single step. For desktop computers and Tablet PCs. - PDF Annotator	en	software-and-applications	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.