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Is there a plugin or snippet that would:

  1. Add an email input form to each post
  2. Send a predefined message when new media (or attachments) has been uploaded for that post only

The requested functionality here is different from other plugins I am aware of because it targets only the end user and only on new media upload (as compared to comments).

Any insight at all would be helpful!

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I am not sure about only media uploads - but there are many notification plugins that will notify users when post is updated. and if you click the "update post" button when new attachment is added - so It will notify them. as for upload via the media upload - I am sure that these plugins can be very easily be adapted to that (just add another trigger action on media save) – krembo99 Mar 29 '12 at 10:55
up vote 1 down vote accepted

As for the email input form, you can use any plugin for Custom Fields ( I use Advanced Custom Fields or Custom Content Type Manager ) or add you own meta box ( tutorial ).

And for sending an email to the address inserted as a custom field, use the following code.
The custom field is named email_warn.

The filter wp_mail_content_type enables html content for emails.
And add_attachment will fire at each upload, pull the parent ID and send an email if the custom field is defined and is a valid email

add_filter( 'wp_mail_content_type', 'wpse_20324_mail_html' );
add_filter( 'add_attachment', 'wpse_20324_post_upload' );

function wpse_20324_mail_html()
    return "text/html";

function wpse_20324_post_upload( $attachment_ID )
    $uploaded = get_post( $attachment_ID );
    $email = get_post_meta( $uploaded->post_parent, 'email_warn', true );

    if( isset( $email ) && is_email( $email ) ) 
         * The message will contain all post info about the uploaded file 
        $vardump = print_r( $uploaded, true );
        $message = '<pre>' . $vardump . '</pre>';

        $headers = 'From: Test WPSE <test@test.com>' . "\r\n";

        wp_mail( $email, 'subject', $message, $headers );
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