How can I edit the email sent when a new comment is received?

Question

I have a multi author site and when a user comments on a post, that author gets an email saying there is a new comment. This email is formated in the standard WordPress way

New comment on your post "Test post for comment testing"
Author : Person (IP: 0.0.0.0 , netowrk) E-mail : [email protected]
URL    : 
Whois  : 
Comment: 
Test

You can see all comments on this post here: 
http://example.com/test-post

Permalink: http://example.com/test-post

The site doesn't utilize URLs in the comment field so this is always blank. I'd also like to remove WHOIS and IP and network details, leaving the commenters name and email.

How can I edit this? Preferably without a plugin if possible.

Answer 1

The comment_notification_text filter is in wp-includes/pluggable.php in the wp_notify_postauthor function. You can copy and paste the $notify_message stuff and edit out what you don't want.

function wpd_comment_notification_text( $notify_message, $comment_id ){
    // get the current comment and post data
    $comment = get_comment( $comment_id );
    $post = get_post( $comment->comment_post_ID );
    // don't modify trackbacks or pingbacks
    if( '' == $comment->comment_type ){
        // build the new message text
        $notify_message  = sprintf( __( 'New comment on your post "%s"' ), $post->post_title ) . "\r\n";
        $notify_message .= sprintf( __('Author : %1$s'), $comment->comment_author ) . "\r\n";
        $notify_message .= sprintf( __('E-mail : %s'), $comment->comment_author_email ) . "\r\n";
        $notify_message .= sprintf( __('URL    : %s'), $comment->comment_author_url ) . "\r\n";
        $notify_message .= __('Comment: ') . "\r\n" . $comment->comment_content . "\r\n\r\n";
        $notify_message .= __('You can see all comments on this post here: ') . "\r\n";
        $notify_message .= get_permalink($comment->comment_post_ID) . "#comments\r\n\r\n";
        $notify_message .= sprintf( __('Permalink: %s'), get_comment_link( $comment_id ) ) . "\r\n";

        if ( user_can( $post->post_author, 'edit_comment', $comment_id ) ) {
            if ( EMPTY_TRASH_DAYS )
                $notify_message .= sprintf( __('Trash it: %s'), admin_url("comment.php?action=trash&c=$comment_id") ) . "\r\n";
            else
                $notify_message .= sprintf( __('Delete it: %s'), admin_url("comment.php?action=delete&c=$comment_id") ) . "\r\n";
            $notify_message .= sprintf( __('Spam it: %s'), admin_url("comment.php?action=spam&c=$comment_id") ) . "\r\n";
        }
    }
    // return the notification text
    return $notify_message;
}
add_filter( 'comment_notification_text', 'wpd_comment_notification_text', 20, 2 );