simon.holliday

FlexiCache is a fast, full-featured and flexible caching system which will improve the performance and availability of any WordPress site.
It is highly configurable to allow unlimited caching rules – expiring different pages at different times, not caching some pages at all, caching multiple versions of the same page depending on browser, language, and so on.
FlexiCache will also work straight out of the box without any need for complex configuration.
<h4>Features</h4>
<ul>
<li>Extensively configurable using user-defined conditions</li>
<li>Handling of high-traffic periods where multiple clients may simultaneously request uncached or expired items</li>
<li>Standalone mode which bypasses WordPress and third-party theme and plugin code to serve cached pages faster</li>
<li>Choice of storage engines: Filesystem, Memcache and SQLite</li>
<li>Pre-caching functionality to cache new versions of pages before the existing ones expire</li>
<li>SQLite indexing of Filesystem and Memcache stores to speed up removing specific items from the cache (automatically enabled if SQLite is available)</li>
<li>Sends appropriate HTTP cache headers to the requesting client</li>
<li>Serves files in compressed formats accepted by the requesting client</li>
<li>Compatible with WordPress MU</li>
</ul>
<h3>Upgrading FlexiCache</h3>
FlexiCache stores config and cache data within the plugin directory (see plugin documentation in versions 1.2.4.2 onwards for the reason why).
If you upgrade the plugin using WordPress’s built-in upgrade process, the entire plugin directory will be replaced, including your config and cache data.
To preserve these, take a copy of the “plugins/FlexiCache/_data” directory before upgrading, and then copy it back after the upgrade is complete.
If you upgrade directly via SVN, this should not be required, since only the files under version control will be updated.
<h3>Deactivating FlexiCache</h3>
FlexiCache can be disabled via the admin interface as with any plugin, however if you are running in Standalone mode, you should remove the .htaccess modifications before deactivating the plugin.
For a standard WordPress install, this modification can be done via the admin interface, however it is recommended that you make this change manually, especially if using WordPress MU, where multiple sites may share the same .htaccess file.
Please see the documentation supplied with the plugin (accessible via WordPress’s admin interface) for more information.

FlexiCache

FlexiCache is a fast, full-featured and flexible caching system which will improve the performance and…

pianoweb

SentWatch monitors WordPress email delivery reliability with instant notifications when problems occur.
The plugin sends periodic “heartbeats” to our monitoring service. If these signals stop arriving, it means your site has stopped sending emails (SMTP issues, plugin conflicts, server problems), and we notify you immediately.
Key Features:
<ul>
<li>Hybrid Heartbeat System – Uses HTTP API with email fallback for maximum reliability</li>
<li>Automatic Time Sync – Plugin synchronizes with server time to prevent false alarms</li>
<li>Instant Notifications – Get alerts immediately when email delivery fails</li>
<li>Zero Configuration – Just enter your API key and you’re done</li>
<li>Lightweight – No performance impact on your site (runs in background)</li>
<li>Smart Scheduling – Heartbeats are automatically aligned with server expectations</li>
</ul>
How It Works:
<ol>
<li>Plugin sends a “heartbeat” signal at regular intervals</li>
<li>Our server tracks when heartbeats arrive</li>
<li>If a heartbeat is missed, we verify your site is reachable</li>
<li>If the issue persists, you receive an instant email notification</li>
</ol>
Subscription Plans:
<ul>
<li>Free – 1 site, 24-hour monitoring interval</li>
<li>Silver – 10 sites, 12-hour interval</li>
<li>Gold – 50 sites, 6-hour interval</li>
<li>Platinum – 200 sites, 3-hour interval</li>
</ul>
Note: This plugin requires a free account on <a href="https://panel.sentwatch.com/register.php" rel="nofollow ugc">SentWatch</a>.
<h3>External Services</h3>
This plugin connects to the SentWatch monitoring service to provide email delivery monitoring functionality.
Service Provider: SentWatch (operated by PianoWeb) 
Service URL: https://panel.sentwatch.com
What data is transmitted:
<ol>
<li>
During initial setup – When you connect the plugin with your API key:
<ul>
<li>Site URL</li>
<li>Site name</li>
<li>WordPress version</li>
<li>PHP version</li>
<li>Plugin version</li>
</ul>
</li>
<li>
During periodic heartbeats – Sent via email at intervals determined by your plan (every 3-24 hours):
<ul>
<li>Timestamp</li>
<li>Site URL</li>
<li>Plugin version</li>
</ul>
</li>
<li>
During status checks – When you view the plugin settings page or when the plugin syncs configuration:
<ul>
<li>Site UUID (unique identifier)</li>
<li>API Key (for authentication)</li>
</ul>
</li>
</ol>
When data is sent: 
– On initial plugin activation and setup 
– Periodically via scheduled email heartbeats (frequency depends on your subscription plan) 
– When you manually test email delivery 
– When the plugin checks for configuration updates (daily)
Why this data is sent: 
This data is necessary for the monitoring service to track whether your WordPress site is successfully sending emails. If heartbeat emails stop arriving, the service alerts you that your site’s email functionality may be broken.
Legal: 
– Terms of Service: https://panel.sentwatch.com/terms.php 
– Privacy Policy: https://panel.sentwatch.com/privacy.php
By using this plugin, you acknowledge that your site will communicate with the SentWatch service as described above.

SentWatch – Email Uptime Monitoring

Monitor WordPress email delivery with instant notifications when problems occur.

FlexiCache vs SentWatch – Email Uptime Monitoring