SmartSMTP

The $text parameter must be a single text string literal. Found: $response->get_error_message()

All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$response_body['message']'.

All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$response_code'.

Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "plugin_locale".

load_plugin_textdomain() has been discouraged since WordPress version 4.6. When your plugin is hosted on WordPress.org, you no longer need to manually include this function call for translations under your plugin slug. WordPress will automatically load the translations for you as needed.

Your plugin has a different license declared in the readme file and plugin header. Please update your readme with a valid GPL license identifier.

Mismatched Requires at least: 5.0 != 5.2. "Requires at least" needs to be exactly the same with that in your main plugin file's header.

Mismatched Requires PHP: 7.2 != 7.4. "Requires PHP" needs to be exactly the same with that in your main plugin file's header.

Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "pre_wp_mail".

Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "wp_mail_from".