by EverPress 0 (0 reviews)

Mailster Kickbox

Name: Mailster Kickbox
Author: EverPress

Verify Mailster subscribers in real time with Kickbox email verification to cut bounces and improve email deliverability.

Mailster Kickbox ranks #47,811 among WordPress.org plugins with 10+ active installations, is #1,273 of 3,634 in the Communication category, and was last updated Oct 13, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1.4

v1.2.1 Current Version v1.2.1

Updated 2 weeks ago Last Update on 13 Oct, 2026

Refreshed 20 hours ago Last Refreshed on

#1,273 of 3,634 in Communication Top 50% by installs Actively maintained

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Rank

#47,811

— No change

Active Installs

10+

-44.4%

KW Avg Position

56.3

0.6 worse

Downloads

4.4K

+4 today

Support Resolved

— No change

Rating

Review 0 out of 5

0 (0 reviews)

Next Milestone 20

Total Progress 50%

10+ 20+

24,638

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Rank Changes

Current #47,811

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

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Plugin Details

Version: 1.2.1
Last Updated: Oct 13, 2026
Requires WP: 6.0+
Tested Up To: 7.1.4
PHP Version: N/A
Author: EverPress

Support & Rating

Rating: ☆ ☆ ☆ ☆ ☆ 0
Reviews: 0
Support Threads: 0
Resolved: 0%

Keywords

deliverability email validation email verification kickbox mailster

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Frequently Asked Questions

Common questions about Mailster Kickbox

No. Mailster Kickbox is an addon for the Mailster Newsletter Plugin and requires Mailster 4.0 or newer.

Yes. You need a Kickbox account and an API key. Kickbox offers free credits to get started; paid plans are available for higher volume.

Addresses are verified when a subscriber is added or updated through Mailster (forms, admin, and other signup flows that use Mailster’s subscriber verification). Bulk import verification is optional and off by default because it can slow large imports — for big lists, use Kickbox list verification first.

You can accept addresses by Kickbox result (deliverable, risky, unknown, undeliverable), reject specific reason codes (for example invalid domain or rejected email), and control role, free, disposable, and accept-all (catch-all) addresses. You can also require a minimum Sendex score.

Verifying subscribers with Kickbox helps keep undeliverable and low-quality addresses out of Mailster, which typically lowers bounce rates and supports better email deliverability over time. Results still depend on your sending practices, content, and ESP.

Yes. To verify an address, this plugin sends the subscriber’s email to the Kickbox API (api.kickbox.com). Kickbox processes the request and returns a verification result. You need a Kickbox account; see Kickbox’s documentation for how their service handles data.

For Mailster and this addon, see mailster.co. For Kickbox API or billing questions, use Kickbox support and docs.