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Best Free WordPress Plugins for Blacklist

15 plugins compared · Updated August 2026 · Blacklist

All 15 Free only Premium only

Choosing a WordPress plugin for blacklist comes down to a few things: whether it is still actively maintained, whether real users rate it well, and whether it does the specific job you need without dragging the rest of the site down.

We ranked 15 plugins using our WPScore, which weighs the user rating (adjusted for how many people actually rated it), how many sites run it, how recently it was updated, and which WordPress version it is tested against. 15 of them have enough public data to be scored; the rest are listed below the ranked block, clearly marked, rather than being given a number we cannot justify.

How this list is funded. Some links here earn us a commission if you buy. It costs you nothing extra, and it does not move anything up the list — the order comes from the WPScore, which is calculated from public ratings, install counts and update history. See the method.

At a glance

  1. 1. Gravity Forms Email Blacklist Best overall 81/100
  2. 2. Block List Updater 80/100
  3. 3. Comment Blacklist Manager 79/100
  4. 4. Blacklist Manager 78/100
  5. 5. Comment Blacklist Updater 78/100
  6. 6. CM E-Mail Blacklist 78/100
  7. 7. BSK Forms Blacklist 70/100
  8. 8. Antideo Email Validator 70/100
  9. 9. Email Blacklist For Elementor Forms 63/100
  10. 10. Gravity Forms Block Email Domains 62/100
  11. 11. Exact Match Disallowed Comment & Contact Forms 59/100
  12. 12. User Domain Whitelist 51/100
  13. 13. Mihdan: Ajax Edit Comments 48/100
  14. 14. Gatekeeper 46/100
  15. 15. Blacklist Unwanted Email 46/100
1 Gravity Forms Email Blacklist
Best overall Free by CrossPeak

Gravity Forms Email Blacklist

Add-on for Gravity Forms to create a Blacklisting of specific emails or domains for the Email input field to throw a validation error or mark as spam.

4.3★
from 15 ratings
10k+
active installs
Updated
May 2026
Tested to
WP 7.0.4
81

WPScore

Read review View on WordPress.org
2 Block List Updater
Free by pluginkollektiv

Block List Updater

Automatic updating of the comment block list in WordPress with antispam keys from GitHub.

4.3★
from 4 ratings
4k+
active installs
Updated
Jun 2026
Tested to
WP 6.9.7
80

WPScore

Read review View on WordPress.org
4 Blacklist Manager
Free by YoOhw Studio

Blacklist Manager

Block risky WooCommerce orders, spam signups, and form submissions with blacklist rules plus checkout email and phone verification.

3.8★
from 13 ratings
2k+
active installs
Updated
Aug 2026
Tested to
WP 7.0.4
78

WPScore

Read review View on WordPress.org
6 CM E-Mail Blacklist
Free by CreativeMindsSolutions

CM E-Mail Blacklist

Block unwanted email registrations on your site with this email blacklist plugin. Protect your site by preventing spam sign-ups.

4.5★
from 8 ratings
800+
active installs
Updated
May 2026
Tested to
WP 7.0.4
78

WPScore

Read review View on WordPress.org
7 BSK Forms Blacklist
Free by bannersky

BSK Forms Blacklist

Checks field content and block submitting base on your keywords. Blocking IP, Country is only supported in the Pro version.

4.3★
from 12 ratings
1k+
active installs
Updated
Sep 2025
Tested to
WP 6.8.8
70

WPScore

Read review View on WordPress.org
8 Antideo Email Validator
Free by Antideo

Antideo Email Validator

Form email validation, Email Blacklist, Domain Blacklist, Form email check, Real time email validator Requires at least: 4.7 Tested up to: 6.9.

3.5★
from 14 ratings
800+
active installs
Updated
Mar 2026
70

WPScore

Read review View on WordPress.org
12 User Domain Whitelist
Free by Warren Harrison

User Domain Whitelist

The User Domain Whitelist/Blacklist plugin limits user registration to only registrants with an email address from the domain white list provided by t …

4.1★
from 9 ratings
300+
active installs
Updated
Dec 2017
51

WPScore

Read review View on WordPress.org
14 Gatekeeper
Free by jamiewilson

Gatekeeper

Gatekeeper allows administrators to take a WordPress site offline while leaving it accessible to authorized users for maintenance, testing, etc.

3.7★
from 3 ratings
200+
active installs
Updated
Oct 2017
Tested to
WP 4.8.30
46

WPScore

Read review View on WordPress.org
15 Blacklist Unwanted Email
Free by abahalkar

Blacklist Unwanted Email

This is a free add-on plugin for Formidable Forms , which validates the email field and restrict unwanted email submission as well as allowed only bus …

5★
from 1 ratings
100+
active installs
Updated
Oct 2019
Tested to
WP 5.3.23
46

WPScore

Read review View on WordPress.org