WP Disable Emails

<?php
/**
* Plugin Name: WDW Disable Mail
* Description: Disable email sending to all but a few emails. Helpful during development. The list of email ids allowed can be changed by editing plugin file
* Author: ckchaudhary
*/

add_filter( "wp_mail", "wdw_disable_wp_mail");
function wdw_disable_wp_mail($details) {
    $allowed_emails = array(
        "developer@site.com",
    );

    $to = $details["to"];
    if(!is_array($to)) {
        $to = explode(",",$to);
    }
    $_to = array();
    foreach($to as $t) {
        if(in_array($t,$allowed_emails)){
            $_to[] = $t;
        }
    }

    $header = $details["headers"];
    $_header = array();
    if( !empty( $header ) ){
        //filter bbc
        foreach($header as $h) {
            $pos = strpos($h, "Bcc:");
            if($pos !== false) {
                $hh = str_replace("Bcc:","",$h);
                $hh = trim($hh);
                if(in_array($hh,$allowed_emails)){ // if this is in whitelist
                    $_header[] = $h;
                }
            } else {
                $_header[] = $h;
            }
        }
    }

    $to = implode(",",$_to);

    $details["to"] = $to;
    $details["headers"] = $_header;

    return $details;
}
?>