Dev tools · alternatives · 2026

24 alternatives to MailTest

Most tools say DKIM failed. MailTest tells you why

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1
DMARC Checker▲70
Verify your DMARC, DKIM, and SPF settings with our free checker. Prevent bad actors from impersonating your domain and improve email deliverability.
2024 · dmarcchecker.app · its alternatives →
2
MailTested▲7
Check why your emails go to spam — instantly.
Nov 2025 · mailtested.com · its alternatives →
3
Mail Tester▲309
Test the spamminess of your email
2016 · mail-tester.com · its alternatives →
4
VaultSandbox – Test your real MailGun/SES/etc. integration▲58
I've spent the last few months working on something I wish I'd had years ago. I kept running into the same issue: CI green, production mail broken. TLS handshake failures, DKIM alignment mismatches, SPF soft-fails ... the stuff that only surfaces when real mail servers are involved. Most test tools (Mailpit, MailHog) are catch-alls. They confirm "an email was sent" but don't validate the protocol. They also aren't designed for network-exposed environments: no auth, unprotected Web UI, easy to enumerate messages. VaultSandbox is my attempt at fixing that. It's a self-hosted SMTP gateway…
Jan 2026 · vaultsandbox.com · its alternatives →
5
Email Inspect▲9
Free dmarc, spf & dkim analyzer tools
Nov 2025 · emailinspect.com · its alternatives →
6
DMARC Checker▲5
Ensure your emails pass DMARC/DKIM/SPF authentication
2024 · dmarcchecker.app · its alternatives →
7
InboxGreen▲1
Free email deliverability checker for SPF, DKIM & DMARC
May 2026 · inboxgreen.email · its alternatives →
8
Email DNS Check
Diagnose SPF, DKIM and DMARC errors instantly
Mar 2026 · its alternatives →
9
Email Deliverability Toolkit▲9
9 free tools to keep your email out of spam
Aug 2026 · truelist.io · its alternatives →
10
MailMedic ‑ Email Health▲1
Scan your domain's SPF, DKIM and DMARC in seconds
Sep 2026 · apps.shopify.com · its alternatives →
11
Email Posture▲5
Get alerted the moment your DMARC, SPF, or DKIM breaks
Jul 2026 · emailposture.com · its alternatives →
12
DKIM.pro▲3
Monitor SPF, DKIM and DMARC before email breaks
May 2026 · dkim.pro · its alternatives →
13
Email Deliverability API & Checker▲2
Instantly audit SPF, DKIM & DMARC to stop landing in spam.
Aug 2026 · web-production-80c77.up.railway.app · its alternatives →
14
DMARC Digests▲101
Protect your brand from email scammers.
2020 · dmarcdigests.com · its alternatives →
15
Proofy▲181
Quickly validate and verify your email lists.
2016 · proofy.io · its alternatives →
16
EmailGuard▲4
Find out why your emails go to spam
Jun 2026 · fixemailsetup.com · its alternatives →
17
EmailAuth.app▲6
Email authentication & deliverability checker
2025 · emailauth.app · its alternatives →
18
MailerCheck 2.0▲145
All-in-one email deliverability platform for businesses
2023 · mailercheck.com · its alternatives →
19
Folderly Lens ▲107
Domain health analysis for high performance email campaigns
Jul 2026 · lens.folderly.com · its alternatives →
20
Protecta360 - Domain Spoof Test▲1
Check DMARC, SPF and DKIM in DNS Settings
Aug 2026 · protecta360.com · its alternatives →
21
Mailnest▲100
Sandbox Email testing tool for IT product, service companies
2020 · mailnest.io · its alternatives →
22
Monitor and Implement DMARC▲86
A free tool to increase your email's deliverability
2015 · dmarc.postmarkapp.com · its alternatives →
23
SimpleSetup▲89
Get Google/Yahoo email compliant
2024 · simplesetup.co · its alternatives →
24
SMTP‑Test.com▲103
One‑click SMTP server test with real‑time protocol logs
2025 · smtp-test.com · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →