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Sites similar to authsmtp.com

Authsmtp alternatives & similar sites

Outgoing authenticated SMTP server and email relay service (solves most SMTP and email relay errors). — 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
emailaddresses.com ↗	66 match 1 shared topics	Email Address Directory : Guide to free email and related services	en	email	robotsllmsaihumans	emailphone	none
sprucesend.com ↗	66 match 1 shared topics	SpruceSend - Custom Email Infrastructure & SMTP Relay Service	en	email	robotsllmsaihumans	emailphone	none
remase.io ↗	65 match 1 shared topics	React Drag and Drop Email editor and management services	en	email	robotsllmsaihumans	emailphone	none
easy-cyprus.com ↗	64 match 1 shared topics	Easy-Cyprus.com Email \| The Email Service for Expats in Cyprus	en	email	robotsllmsaihumans	emailphone	none
dao-mail.com ↗	64 match 1 shared topics	Dao-Mail – Free Email Service	en	email WordPress	robotsllmsaihumans	emailphone	none
1timemail.org ↗	64 match 1 shared topics	1TimeMail \| Free Temporary Email Service \| Disposable Email Generator	en	email	robotsllmsaihumans	emailphone	none
4email.com ↗	64 match 1 shared topics	4Email -- Search Engine for Email Products, Services, and Information	en	email	robotsllmsaihumans	emailphone	none
hhmailserver.com ↗	64 match 1 shared topics	hhmailserver.com – Mail Service	en	email WordPress	robotsllmsaihumans	emailphone	none
ether-mailer-bl.com ↗	64 match 1 shared topics	Ether Mailer SMTP Server	en	email	robotsllmsaihumans	emailphone	none
ether-mailer-pr.com ↗	64 match 1 shared topics	Ether Mailer SMTP Server	en	email	robotsllmsaihumans	emailphone	none
btotmail.com ↗	64 match 1 shared topics	BTOTMail - Reliable Enterprise Email API and SMTP Platform	en	email	robotsllmsaihumans	emailphone	none
hippo-email-checker.com ↗	64 match 1 shared topics	Email Checker Services from Email Hippo \| Hippo Email Checker	en	email	robotsllmsaihumans	emailphone	none
replylater.com ↗	64 match 1 shared topics	ReplyLater - Email Reminder Service	en	email	robotsllmsaihumans	emailphone	none
email-service24.ch ↗	64 match 1 shared topics	email service 24	Switzerland en	email WordPress WooCommerce	robotsllmsaihumans	emailphone	none
1dollaremail.com ↗	64 match 1 shared topics	$1 Email Service For 30 Days	en	email Wix	robotsllmsaihumans	emailphone	none
1likesub.com ↗	64 match 1 shared topics	TempMail - Free Temporary Email Service	en	email	robotsllmsaihumans	emailphone	partial · 8
4memail.com ↗	64 match 1 shared topics	Temp Mails \| 4meMail - The Best Temp Email Service	en	email	robotsllmsaihumans	emailphone	none
anypost.com ↗	64 match 1 shared topics	Transactional and broadcast email service - Anypost	en	email	robots llmsaihumans	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.