Site Mailer - SMTP Replacement, Email API Deliverability & Email Log 1.3.0

Does "Site Mailer - SMTP Replacement, Email API Deliverability & Email Log" work with WordPress 6.8.3 and PHP 8.1.12? A smoke test was performed on .

Summary

Errors
3Unrecognized messages in the PHP error log
No JavaScript exceptions
All test pages loaded successfully
No resource errors
Performance

Memory usage: 136.6 KiB
The average PHP memory usage increased by this amount after activating by the plugin.

Page speed impact: insignificant.
The plugin didn't make the site noticeably slower.

Environment
WordPress version6.8.3
PHP version8.1.12
MySQL version10.6.10
PHP memory limit512M
Plugin Info
Last updated
Active installs 100,000+
WordPress.org page https://wordpress.org/plugins/site-mailer/
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Pages 3

Plugins ‹ Test site — WordPress

Page screenshot: Plugins ‹ Test site — WordPress
URL /wp-admin/plugins.php?plugin_status=all&paged=1&s
Requested URL /wp-admin/plugins.php?action=activate&plugin=site-mailer%2Fsite-mailer.php&plugin_status=all&paged=1&s&_wpnonce=86b221113c
Aspect after-activation
HTTP status 200
Load time 0.887 s
Memory usage 3.91 MiB
JS errors None
Resource errors None

Settings → Site Mailer

Page screenshot: Settings → Site Mailer
URL /wp-admin/options-general.php?page=site-mailer-settings
Aspect menu-item
HTTP status 200
Load time 1.091 s
Memory usage 3.63 MiB
JS errors None
Resource errors None

Test site – Just another WordPress site

Page screenshot: Test site – Just another WordPress site
URL /
Aspect front-page
HTTP status 200
Load time 0.371 s
Memory usage 3.52 MiB
JS errors None
Resource errors None

Benchmark

URL Load time Memory usage
Inactive Active Change Inactive Active Change
/wp-admin/index.php0.353 s0.302 s-0.051 s3.51 MiB3.61 MiB+ 106.79 KiB
/wp-admin/edit.php0.185 s0.317 s+0.132 s3.57 MiB3.67 MiB+ 104.6 KiB
/wp-admin/post-new.php0.805 s1.196 s+0.391 s6.06 MiB6.41 MiB+ 360.42 KiB
/wp-admin/upload.php1.082 s0.752 s-0.330 s3.52 MiB3.61 MiB+ 86.83 KiB
/wp-admin/options-writing.php0.386 s0.399 s+0.013 s3.5 MiB3.59 MiB+ 92.79 KiB
/wp-admin/media-new.php0.421 s0.453 s+0.032 s3.49 MiB3.59 MiB+ 99.02 KiB
/wp-admin/edit-tags.php?taxonomy=category0.281 s0.312 s+0.031 s3.5 MiB3.61 MiB+ 109.69 KiB
/wp-admin/post-new.php?post_type=page1.389 s1.101 s-0.288 s6.05 MiB6.4 MiB+ 355.95 KiB
/wp-admin/options-discussion.php0.356 s0.457 s+0.101 s3.5 MiB3.59 MiB+ 89.29 KiB
/wp-admin/edit-comments.php0.336 s0.316 s-0.020 s3.52 MiB3.61 MiB+ 86.82 KiB
/0.420 s0.280 s-0.140 s3.5 MiB3.51 MiB+ 10.45 KiB
Average 0.547 s0.535 s-0.012 s3.98 MiB4.11 MiB+ 136.6 KiB

Code Statistics

Note: Third-party libraries and minified JS/CSS files are excluded from these statistics where possible, so the numbers you see here may be lower than those reported by other tools.

PHP
JavaScript
Language % Lines of code Comment lines Files
PHP77.1%6,3912,31798
JavaScript17.9%1,4814327
CSS3.1%25337
Markdown2.0%16301
Total 8,288 2,363 133

PHP Code Analysis | More results »

Lines of code 6,360
Total complexity 1,020
Median class complexity 6.0
Median method complexity 1.0
Most complex class SiteMailer\Classes\Database\Table
Most complex function SiteMailer\Classes\Services\Client::request()
Classes 94
Methods 505
Functions 0

Additions

Things that the plugin adds to the site. This section is not intended to be comprehensive. The test tool only looks for a few specific types of added content.

Database Tables 3

Options wp_options 6

PHP Error Log 3 lines

[05-Nov-2025 13:52:27 UTC] [Site Mailer]: error in SiteMailer\Modules\Settings\Module::refresh_plan_data(): Invalid connect data
[05-Nov-2025 13:52:27 UTC] [Site Mailer]: error in SiteMailer\Modules\Settings\Module::refresh_plan_data(): Invalid connect data
[05-Nov-2025 13:52:27 UTC] [Site Mailer]: error in SiteMailer\Modules\Settings\Module::refresh_plan_data(): Invalid connect data
See also: All tests for this plugin, How to Hide the "Site Mailer" Admin Menu