This plugin enhances the security and stability of your WordPress installation by delaying and controlling wp_mail() email submissions through a managed queue.
If your site exhibits unusual behavior — such as a spam bot repeatedly submitting forms — you will be alerted immediately.
<ul>
<li>Intercepts wp_mail() and places outgoing messages in a queue</li>
<li>Configure how many emails are sent and at what interval</li>
<li>Log all queued email submissions</li>
<li>Receive alerts when the queue grows unexpectedly</li>
<li>Receive alerts when WordPress is unable to send emails</li>
</ul>

Mail Queue

Take control of emails sent by WordPress. Queue outgoing emails and get notified instantly if your website is trying to send too many emails at once!

Mark McNeece of 365i

365i Queue Optimizer is an ultra-lightweight WordPress plugin designed to optimize ActionScheduler performance for faster image processing and background task execution. It automatically detects your server environment and recommends optimal settings. Perfect for sites using image optimization plugins, WooCommerce, or any plugin that relies on ActionScheduler.
<h3>What This Plugin Does</h3>
This plugin applies essential ActionScheduler optimizations with intelligent server detection:
<ul>
<li>Time Limit Control – Sets how long ActionScheduler processes tasks (default: 60 seconds, configurable 10-300)</li>
<li>Concurrent Batch Processing – Controls simultaneous background processes (default: 4 batches, configurable 1-10)</li>
<li>Batch Size Control – Sets how many actions to process per batch (default: 50, configurable 25-200)</li>
<li>Data Retention – Controls how long completed action logs are kept (default: 7 days, configurable 1-30)</li>
<li>Image Processing Engine – Prioritizes your chosen image processor (ImageMagick by default, GD fallback)</li>
</ul>
<h3>Key Features</h3>
<ul>
<li>Dashboard Widget – At-a-glance queue status on your WordPress dashboard with health indicators</li>
<li>Server Detection – Automatically detects your hosting type (Shared, VPS, Dedicated) and recommends optimal settings</li>
<li>One-Click Optimization – Apply recommended settings instantly based on your server environment</li>
<li>Run Queue Now – Manually trigger queue processing when you need immediate results</li>
<li>Ultra-Lightweight – Minimal server impact with no complex logging or debugging overhead</li>
<li>Simple Configuration – Clean settings page under Tools > Queue Optimizer</li>
<li>Instant Results – Optimizations apply automatically after activation</li>
<li>WordPress Standards – Follows all WordPress coding and security standards</li>
<li>ImageMagick-First Defaults – Prefers ImageMagick for better quality and stability when available</li>
</ul>
<h3>Perfect For</h3>
<ul>
<li>Image Optimization – Faster processing with Elementor Image Optimizer, Smush, ShortPixel, etc.</li>
<li>WooCommerce Sites – Better handling of product imports, order processing, and bulk operations</li>
<li>High-Volume Sites – Improved performance for sites with large background task queues</li>
<li>Plugin Compatibility – Works with any plugin that uses ActionScheduler</li>
</ul>
<h3>Philosophy</h3>
Simple, fast, and effective. This plugin does one thing well: optimize ActionScheduler performance with minimal overhead and maximum compatibility.
<h3>Usage</h3>
<h3>Dashboard Widget</h3>
The Queue Optimizer dashboard widget appears on your WordPress admin dashboard and shows:
<ul>
<li>Health Status – Overall queue health (Healthy, Backlog, or Needs Attention)</li>
<li>Pending Actions – Number of actions waiting to be processed</li>
<li>Running Actions – Actions currently being processed</li>
<li>Failed Actions – Actions that failed in the last 24 hours</li>
<li>Run Queue Button – Manually trigger queue processing</li>
</ul>
<h3>Settings Configuration</h3>
Time Limit (10-300 seconds) 
Controls how long ActionScheduler processes tasks in each batch. Recommended values: 
* Shared hosting: 30 seconds 
* VPS/Managed: 60 seconds 
* Dedicated/High: 120 seconds
Concurrent Batches (1-10 batches) 
Determines how many background processes run simultaneously. Recommended values: 
* Shared hosting: 2 batches 
* VPS/Managed: 4 batches 
* Dedicated/High: 8 batches
Batch Size (25-200 actions) 
Sets how many actions are processed in each batch. Recommended values: 
* Shared hosting: 25 actions 
* VPS/Managed: 50 actions 
* Dedicated/High: 100 actions
Data Retention (1-30 days) 
Controls how long completed action logs are stored. Lower values reduce database size. Recommended values: 
* Shared hosting: 3 days 
* VPS/Managed: 7 days 
* Dedicated/High: 14 days
Image Processing Engine (ImageMagick or GD) 
Prioritizes your chosen image processing library. ImageMagick is preferred for quality and stability.
<h3>Server Environment</h3>
The settings page displays your server environment including: 
* Detected hosting type (Shared, VPS, Dedicated) 
* PHP version and memory limit 
* WordPress version 
* Max execution time 
* ImageMagick and GD availability 
* WebP and AVIF support
<h3>Queue Status</h3>
Monitor your ActionScheduler queue with real-time stats: 
* Pending actions count with breakdown by hook type 
* Currently running actions 
* Failed actions in the last 24 hours 
* Quick link to view all actions in ActionScheduler
<h3>Support</h3>
For detailed documentation and usage examples, see the <a href="https://www.365i.co.uk/blog/2025/04/20/fix-wordpress-6-8-slow-image-uploads-with-365i-queue-optimizer/" rel="nofollow ugc">complete plugin guide</a>.
For support and WordPress hosting solutions optimized for performance, visit <a href="https://www.365i.co.uk/" rel="nofollow ugc">365i WordPress Hosting</a>.
Professional WordPress hosting with ActionScheduler optimization built-in.

365i Queue Optimizer

A lightweight WordPress plugin to optimize ActionScheduler queue processing for faster image optimization and background tasks.

Mail Queue vs 365i Queue Optimizer