Example of how to add additional message stati to FHEE__EEM_Message__stati_indicating_to_send

tw_ee_filter_stati_indicating_to_send.php

<?php
//* Please do NOT include the opening php tag, except of course if you're starting with a blank file

add_filter(
    'FHEE__EEM_Message__stati_indicating_to_send',
    'tw_ee_filter_stati_indicating_to_send'
);
function tw_ee_filter_stati_indicating_to_send( $stati_array ) {
    $stati_array[] = EEM_Message::status_retry;
    return $stati_array;
}