How to auto send email when publishing a custom post type?

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I’d like to have an email automatically sent out to my website’s subscribers when I publish a post for a specific custom post type. I’ve found a few plugins that will do this but only for regular posts (or for any post type that gets published, not allowing you to specify a particular post type). Any suggestions would be greatly appreciated! Thanks.

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  1. Hook into transition_post_status, fetch the users and send an email to all users.

    Sample code, not tested:

    add_action( 'transition_post_status', 'send_mails_on_publish', 10, 3 );

function send_mails_on_publish( $new_status, $old_status, $post )
{
    if ( 'publish' !== $new_status or 'publish' === $old_status
        or 'my_custom_type' !== get_post_type( $post ) )
        return;

    $subscribers = get_users( array ( 'role' => 'subscriber' ) );
    $emails      = array ();

    foreach ( $subscribers as $subscriber )
        $emails[] = $subscriber->user_email;

    $body = sprintf( 'Hey there is a new entry!
        See <%s>',
        get_permalink( $post )
    );


    wp_mail( $emails, 'New entry!', $body );
}

    You should probably use the Bcc field.

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