by WDM 5 (8 reviews)

Mail Queue

Gain full control over your WordPress emails. Queue outgoing emails and get alerts when your site tries to send unusually high volumes.

Mail Queue ranks #6,701 among WordPress.org plugins with 1,000+ active installations, is #279 of 3,634 in the Communication category, a 5/5 rating from 8 reviews, and was last updated Sep 15, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1.4

v1.6.2 Current Version v1.6.2

Updated 1 month ago Last Update on 15 Sep, 2026

Refreshed 2 days ago Last Refreshed on

#279 of 3,634 in Communication Top 10% by installs Downloads -33.7% this week

View on WordPress.org

Rank

#6,701

— No change

Active Installs

1K+

-11.8%

KW Avg Position

35.8

0.2 better

Downloads

12.9K

+4 today

Support Resolved

100%

— No change

Rating

100%

Review 5 out of 5

5 (8 reviews)

Next Milestone 2K

Total Progress 19.2%

1K+ 2K+

1,681

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Need 808 more installs to reach 2K+

Rank Changes

Current #6,701

Change

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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

5.0

8 reviews

Overall 100%

8 (100%)

0 (0%)

Support Threads Overview

Resolved

Unresolved

Total Threads

Resolved

Unresolved

100%

Resolution Rate

Security History

Source: WPVulnerability

1 known vulnerability on record · 0 in the last 24 months · checked 3 months ago

Jun 22, 2023

Mail Queue [mail-queue] < 1.2

CVE-2023-3167 · Fixed in v1.2

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Plugin Details

Version: 1.6.2
Last Updated: Sep 15, 2026
Requires WP: 5.9+
Tested Up To: 7.1.4
PHP Version: 7.4 or higher
Author: WDM

Support & Rating

Rating: ★ ★ ★ ★ ★ 5
Reviews: 8
Support Threads: 2
Resolved: 100%

Keywords

email email log mail queue wp_mail

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TL;DR

AI summary of the plugin's readme

This plugin is for WordPress site owners and administrators who want oversight of outgoing emails. It solves the problem of uncontrolled or unusually high email volumes by queuing wp_mail() submissions and alerting on abnormal activity.

Intercepts wp_mail() submissions
Configurable send rate and interval
Pause queue without disabling plugin
Logs queued emails, alerts, events
Alerts on unexpected queue growth
Auto-pause queue on alert
Send queued emails immediately
Prioritizes password reset emails

Frequently Asked Questions

Common questions about Mail Queue

Yes. Once activated, please go into the plugin settings and configure the queue for your website. You can choose whether the Mail Queue should be Enabled, Paused, or Disabled, and you can control how many emails are sent and how often they should be sent. You can also enable alerts, define the queue size threshold for alerts, and optionally enable automatic pausing when an alert is triggered.

When the Mail Queue is enabled, the plugin intercepts wp_mail(). Instead of sending emails immediately, they are stored in the database and released gradually via WP-Cron according to your configured interval. The plugin offers three states: Enabled: emails are added to the queue and sent gradually by WP-Cron. Paused: emails are still added to the queue, but no queued emails are sent until you enable the queue again. Disabled: the plugin does not intercept wp_mail() and has no effect on outgoing emails.

No. This plugin does not change HOW the emails are sent. For example: If you use SMTP for sending, or a third-party-service like Mailgun, everything will still work. This plugin changes WHEN the emails are sent. By the email Queue it gives you control about how many emails should be sent in which interval.

If you're using a caching plugin like W3 Total Cache, WP Rocket or any other caching solution which generates static HTML files and serves them to visitors, you'll have to make sure you're calling the wp-cron file manually every couple of minutes. Otherwise your normal WP Cron wouldn't be called as often as it should be and scheduled messages would be sent with big delays.

Same situation here. Please make sure you're calling the WordPress Cron by an external service or your webhoster every couple of minutes.

You are covered. All attachments are stored temporarily in the queue until they are sent along with their corresponding emails.

Queue alerts are a simple and effective way to improve the security of your WordPress installation. Imagine your website starts sending spam through wp_mail(). The Mail Queue would fill up quickly instead of sending everything at once. This gives you time to react, avoid a lot of trouble and can reduce the damage significantly. Queue alerts warn you when the queue grows longer than usual. You configure in the settings at which threshold you want to be alerted. This gives you the chance to review the queue and investigate whether something unusual is happening on the website. Optionally, you can enable automatic pausing when an alert is triggered. In that case the queue stops sending emails until you change the status back to Enabled. Please note: This plugin sends at most one alert every six hours while the queue remains above the configured threshold.

Yes. The Mail Queue can be set to Paused.

This is useful if you want to temporarily stop outgoing delivery without disabling the plugin completely.

Yes, you can add the custom X-Mail-Queue-Prio header set to High to your email. High priority emails are still processed through the normal Mail Queue cycle, but they are sent before normal queued emails. Example 1 (add priority to WooCommerce emails): add_filter('woocommerce_mail_callback_params',function ( $array ) { $prio_header = 'X-Mail-Queue-Prio: High'; if (is_array($array[3])) { $array[3][] = $prio_header; } else { $array[3] .= $array[3] ? "\r\n" : ''; $array[3] .= $prio_header; } return $array; },10,1); Example 2 (add priority to Contact Form 7 form emails):