^^&&^^

Edit File: class-suggestion.php

<?php
/**
 * Suggestion save and send email.
 *
 * @package documentor
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Suggestion
 *
 * @class       Documentor_Suggestion
 * @package     documentor
 */
class Documentor_Suggestion {
    /**
     * Send suggestion.
     *
     * @param array $data - suggestion data.
     *
     * @return boolean
     */
    public static function send( $data ) {
        self::mail_before_send();

$success = self::process_mail( $data );

self::mail_after_send();

return $success;
    }

/**
     * Process email using wp_mail function.
     *
     * @param array $data - Form block attributes.
     *
     * @return boolean
     */
    public static function process_mail( $data ) {
        if ( isset( $data['from'] ) && ! empty( $data['from'] ) ) {
            $from = $data['from'];
        } elseif ( is_user_logged_in() ) {
            $from = '';

$user = wp_get_current_user();

if ( $user->display_name ) {
                $from = $user->display_name;
            }

if ( $user->user_email ) {
                $from .= ( $from ? ' <' : '' ) . $user->user_email . ( $from ? '>' : '' );
            }
        } else {
            $from = esc_html__( 'Anonymous', 'documentor' );
        }

$data['from']       = $from;
        $data['ip_address'] = self::get_ip_address();
        $data['blogname']   = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

// phpcs:ignore
        $wp_email = 'wordpress@' . preg_replace( '#^www\.#', '', strtolower( $_SERVER['SERVER_NAME'] ) );

$email_to = documentor()->get_option( 'show_feedback_suggestion_email', 'documentor_single', '' ) ? documentor()->get_option( 'show_feedback_suggestion_email', 'documentor_single', '' ) : get_option( 'admin_email' );

// translators: %s - blog name.
        $subject = sprintf( esc_html__( '[%s] New Doc Suggestion', 'documentor' ), $data['blogname'] );

// Prepare headers.
        $headers  = 'Content-Type: text/html; charset="' . get_option( 'blog_charset' ) . "\"\n";
        $headers .= 'From: "' . esc_html( $data['from'] ) . "\" <$wp_email>\n";
        $headers .= "Reply-To: \"$wp_email\" <$wp_email>\n";

// Prepare message.
        $message = self::get_mail_html( $data );

return wp_mail( $email_to, wp_specialchars_decode( $subject ), $message, $headers );
    }

/**
     * Get mail HTML template.
     *
     * @param array $attributes - From block attributes.
     *
     * @return string
     */
    public static function get_mail_html( $attributes ) {
        ob_start();

documentor()->get_template_part(
            'feedback-mail',
            array(
                'data' => $attributes,
            )
        );

return ob_get_clean();
    }

/**
     * Get a clients IP address
     *
     * @return string
     */
    public static function get_ip_address() {
        $ipaddress = '';

// phpcs:disable
        if ( isset( $_SERVER['HTTP_CLIENT_IP'] ) ) {
            $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
        } elseif ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
            $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
        } elseif ( isset( $_SERVER['HTTP_X_FORWARDED'] ) ) {
            $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
        } elseif ( isset( $_SERVER['HTTP_FORWARDED_FOR'] ) ) {
            $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
        } elseif ( isset( $_SERVER['HTTP_FORWARDED'] ) ) {
            $ipaddress = $_SERVER['HTTP_FORWARDED'];
        } elseif ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
            $ipaddress = $_SERVER['REMOTE_ADDR'];
        } else {
            $ipaddress = 'UNKNOWN';
        }
        // phpcs:enable

return $ipaddress;
    }

/**
     * Mail before send.
     */
    public static function mail_before_send() {
        add_filter( 'wp_mail_content_type', array( __CLASS__, 'get_content_type' ) );
    }

/**
     * Mail after send.
     */
    public static function mail_after_send() {
        remove_filter( 'wp_mail_content_type', array( __CLASS__, 'get_content_type' ) );
    }

/**
     * Change wp_mail content type to HTML.
     *
     * @return string
     */
    public static function get_content_type() {
        return 'text/html';
    }
}