该技术与wpmu_signup_user_notification().

function wpmu_welcome_user_notification($user_id, $password, $meta = \'\') {
    global $current_site;

    $welcome_email = get_site_option( \'welcome_user_email\' );

    $user = new WP_User($user_id);

    $welcome_email = apply_filters( \'update_welcome_user_email\', $welcome_email, $user_id, $password, $meta);

    // Get the current blog name
    $blogname = get_option( \'blogname\' );
    $welcome_email = str_replace( \'SITE_NAME\', $blogname, $welcome_email );

    $welcome_email = str_replace( \'USERNAME\', $user->user_login, $welcome_email );
    $welcome_email = str_replace( \'PASSWORD\', $password, $welcome_email );
    $welcome_email = str_replace( \'LOGINLINK\', wp_login_url(), $welcome_email );

    $admin_email = get_site_option( \'admin_email\' );

    if ( $admin_email == \'\' )
         $admin_email = \'support@\' . $_SERVER[\'SERVER_NAME\'];

    $from_name = get_site_option( \'site_name\' ) == \'\' ? \'WordPress\' : esc_html( get_site_option( \'site_name\' ) );
    $message_headers = "From: \\"{$from_name}\\" <{$admin_email}>\\n" . "Content-Type: text/plain; charset=\\"" . get_option(\'blog_charset\') . "\\"\\n";
    $message = $welcome_email;

    $subject = apply_filters( \'update_welcome_user_subject\', sprintf(__(\'New %1$s User: %2$s\'), $blogname, $user->user_login) );
    wp_mail($user->user_email, $subject, $message, $message_headers);

    return false; // make sure wpmu_welcome_user_notification() doesn\'t keep running
}
add_filter( \'wpmu_welcome_user_notification\', \'bbg_wpmu_welcome_user_notification\', 10, 3 );