Emailing Authors only when a CUSTOM POST TYPE post is published- not when edited later [duplicate]

Question

I have the following function that emails authors of a custom post type when the post is published which is great, but I would like it so that it does not email them on any future edits after that to avoid sending them loads of emails by accident.

This is the function I have at the moment:

//email authors
function authorNotification($post_id) {
   $post = get_post($post_id);
   $author = get_userdata($post->post_author);

   $message = "Hi ".$author->display_name.".
A document for you, ".$post->post_title." has just been published or edited and requires your attention. 
You will be taken to the document after you log in from this link: ".get_permalink( $post_id ).".
   ";
   wp_mail($author->user_email, "An online document has been made or edited for you.", $message);
}
add_action('publish_portaldocuments', 'authorNotification');

I'm wondering if it has something to do with the The {$old_status}to{$new_status} and {$new_status}_{$post->post_type} hooks as on this page: Post publish only hook?

Could someone help please as I'm not sure how I would implement it WITH A CUSTOM POST TYPE. Thanks :-)

Update: This worked for me:

// SEND EMAIL TO AUTHOR OF A CUSTOM POST TYPE ONCE POST IS PUBLISHED

function authorNotification($post_id) {
    if( ( $_POST['post_status'] == 'publish' ) && ( $_POST['original_post_status'] != 'publish' ) ) {
 $post = get_post($post_id);
   $author = get_userdata($post->post_author);

   $message = "Hi ".$author->display_name.".
A document for you, ".$post->post_title." has just been published or edited and requires your attention. 
You will be taken to the document after you log in from this link: ".get_permalink( $post_id ).".
   ";
   wp_mail($author->user_email, "An online document has been made or edited for you.", $message);
    }
}

add_action( 'publish_portaldocuments', 'authorNotification' );

Answer 1

Yes, it sounds like you do want a post transition hook, probably draft_to_publish as per the following from the Codex:

function your_callback( $post ) {
    // Code here
}
add_action( 'draft_to_publish', 'your_callback' );

Use authorNotification-- your function name-- instead of your_callback. It should be fairly simple in your case.

However, the precise details of your project are not clear. You may require something more complex. I can't tell.