Growth · alternatives · 2026

24 alternatives to Email Spam Checker by Autoklose

Send spam-free, high-converting emails

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Email Spam Checker by Autoklose launched in 2020; newer entries below may have overtaken it.

1. 1
   Warmup Inbox▲204

   Free email spam checker & inbox placement tester

   2023 · warmupinbox.com · its alternatives →

2. 2
   Mail Tester▲309

   Test the spamminess of your email

   2016 · mail-tester.com · its alternatives →

3. 3
   Spam Checker by Mailmeteor▲88

   Detect and remove spam words in your emails

   2022 · mailmeteor.com · its alternatives →

4. 4
   You've Got Spam▲305

   A new tool that lets you spam back the spammer

   2020 · youvegotspam.mschfmag.com · its alternatives →

5. 5
   Unspam AI▲385

   See how your subscribers read your emails with our AI inbox

   2024 · unspam.email · its alternatives →

6. 6
   Unspam.email▲299

   Email spam checker and newsletter heatmap prediction.

   2020 · unspam.email · its alternatives →

7. 7
   Email Copy Checker▲5

   Check your emails for spam trigger words before hitting send

   2017 · emailcopychecker.com · its alternatives →

8. 8
   mailX by mailwarm▲596

   Email deliverability toolkit for humans and AI agents

   May 2026 · themailx.com · its alternatives →

9. 9
   Generect Email Finder▲466

   Verify and validate emails at scale

   2024 · generect.com · its alternatives →

10. 10
    Vetter▲134

    Test if your emails will be spammed, using real accounts.

    2020 · vetter.monsoonyeti.com · its alternatives →

11. 11
    Mailook▲309

    Identify & fix your email deliverability issues for free

    2021 · mailook.ai · its alternatives →

12. 12
    KleanMail Free Email Verifier▲177

    Emails inboxed, always.

    2022 · kleanmail.com · its alternatives →

13. 13
    Autoklose 1.0▲172

    Machine learning assisted email follow-up

    2018 · app.autoklose.com · its alternatives →

14. 14
    Spam Check▲93

    A free JSON API to check your email messages' spam scores

    2015 · spamcheck.postmarkapp.com · its alternatives →

15. 15
    Email Bounce Checker from BlockSurvey▲98

    Privacy-focused email bounce checker. No ads, no trackers.

    2022 · blocksurvey.io · its alternatives →

16. 16
    MailDump▲270

    Find, extract and verify emails automatically

    2018 · maildump.co · its alternatives →

17. 17
    Mailercloud▲257

    Automate, optimize, convert, next level email automation

    2024 · mailercloud.com · its alternatives →

18. 18
    Breadcrumbs Free Email Verifier▲160

    Free forever to validate up to 10,000 emails with 1-click

    2020 · breadcrumbs.io · its alternatives →

19. 19
    Free Email Verifier▲202

    The first free and accurate email verification service

    2020 · gmass.co · its alternatives →

20. 20
    MailCheck▲49

    Stop Free Trial Abuse with Advanced Email Verification

    2025 · mail-check.tech · its alternatives →

21. 21
    Email Warmup By SalesBlink▲151

    Fully automated email warm-up. Never land in spam again!

    2022 · salesblink.io · its alternatives →

22. 22
    Checker▲124

    Detect fake signups in under 200ms with an easy-to-use API

    2025 · its alternatives →

23. 23
    A free tool to easily check your SpamAssasin Score▲12

    Instantly check an email

    2015 · spamcheck.postmarkapp.com · its alternatives →

24. 24
    Email Template Library by Autoklose▲94

    A free collection of well-crafted and effective email copy

    2020 · app.autoklose.com · its alternatives →

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 →