[Exim] Exim Bulk Delivery Optimization?

    I sometimes send out e-mails with 100k+ recipients for newsletters
and notifications for my company.  When this happens, Exim takes a very long
time to presort the list of addresses (8 hours).  Is there a way to get Exim
to send them ASAP?  I understand that it would not be optimal to do it this
way, but I still need to speed up the time to start deliveries.

     YL