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SMTP Test Tool - Free Online SMTP Server Tester — 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
authsmtp.com ↗	67 match shared topic	Outgoing authenticated SMTP server and email relay service (solves most SMTP and email relay errors).	en	email	robotsllmsaihumans	emailphone	none
mail-tester.com ↗	67 match shared topic	Newsletters spam test by mail-tester.com	en	email	robotsllmsaihumans	emailphone	none
postmarkapp.com ↗	61 match shared topic	Postmark: Fast, Reliable Email Delivery Service \| SMTP \| API	en	email	robots llmsaihumans	emailphone	none
zerobounce.net ↗	61 match shared topic	Email Validation Tools & Email List Cleaning \| ZeroBounce	United States~ en	email	robotsllmsaihumans	email phone	none
screenshot-tool.com ↗	61 match shared topic	Screenshot Tool \| Capture screen or window from Gmail	Canada~ en	email	robotsllmsaihumans	emailphone	none
magicmail.com ↗	61 match shared topic	Carrier-Grade Email Server for the ISP, Telco and Cable Industry \| MagicMail	en	email	robotsllmsaihumans	emailphone	none
icont.ac ↗	61 match shared topic	Welcome to iContact's Social Tools!	en	email	robotsllmsaihumans	emailphone	none
xeams.com ↗	61 match shared topic	Xeams - a free email server with 100% privacy and security.	en	email	robots llmsaihumans	emailphone	none
netwinsite.com ↗	61 match shared topic	FTP Server, Email Secure Server, Email Server, Secure FTP, Webmail	en	email	robotsllmsaihumans	emailphone	none
mailercloud.com ↗	61 match shared topic	Mailercloud: An All In One Email Marketing Tool	en	email WooCommerce	robotsllmsaihumans	emailphone	partial · 8
mailinator.com ↗	61 match shared topic	Mailinator Home \| Email Testing - Mailinator	en	email WordPress WooCommerce	robots llmsaihumans	emailphone	none
smtp.com ↗	61 match shared topic	SMTP Email Delivery & Transactional Email API \| SMTP.com	en	email WordPress	robotsllmsaihumans	emailphone	none
wpmailsmtp.com ↗	61 match shared topic	WP Mail SMTP Pro - #1 WordPress SMTP Plugin in the World	en	email WordPress	robots llmsaihumans	emailphone	none
smtp2go.com ↗	61 match shared topic	SMTP2GO: Reliable & Scalable Email Delivery Service & API	en	email WordPress	robots llmsaihumans	emailphone	none
afterlogic.com ↗	61 match shared topic	AfterLogic Corp. — mail server, webmail client, email components	en	email Joomla	robotsllmsaihumans	emailphone	none
emailct.com ↗	61 match shared topic	Emailct.com - Mail Domain - Mail Server - Mail tên miền - Mail tạm thời - Mail lâu dài - Temp Mail- Mail 10 phút - Hệ thống mail - Mail tên miền miễn phí	en	email	robotsllmsaihumans	emailphone	none
zimbra.com ↗	55 match shared topic	Open Standards \| Low-Risk Alternative \| Data Sovereignty \| Zimbra	en	email WordPress	robotsllmsaihumans	emailphone	none
hover.com ↗	55 match shared topic	Domain Names \| Buy Domains & Email At Hover.com	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.