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Several of my sites (though not all) suddenly started showing this message after updating to WP 6.3.1 (from 6.3.0 where no message was present).
The FluentSMTP plugin depends on wp_mail pluggable function and plugin is not able to extend it. Please check if another plugin is using this and disable it for FluentSMTP to work!
Possible Conflict: /var/www/URL/htdocs/wp-includes/pluggable.php:174
- This topic was modified 13 hours, 31 minutes ago by .