[exim] Deleting a mail that is busy sending

Hi all

I have a question I need answering

I have an exim mailserver

Sometimes the users tend to get a littlebit overzealous with sending big
mails, I have set up limits to limit the size of the mail to 6M. They
sometimes try to send a 2M email to 300 rcpts. (overestimating)

Is there a way I can tell exim to cancel sending the email, so that I can
delete it?

Regards
Ian