If I create a page with two forms to update the record setting the sent field to 1 and have it submit "before load". It can be populated by one of two recordsets and two forms. The first counts the email to be sent and as long as there are two or more then the redirect can be to the same page, a loop.
The second count for 1 or less and it shows a form which redirects to blank page there by stoping the loop.
Would this work?