[exim] slow mail server

Hi all, have put up a slow mail server to handle any email that is not
delivered in 24 hours. The idea being to keep the queues on our main
outgoing mail server a clear a possible.

We use the following router to do this.

too_old:
driver = manualroute
condition = ${if > {$message_age}{86400}{yes}{no}}
transport = remote_smtp
route_list = * slowcoach.lut.ac.uk

Most old mail does get moved to the slowcoach server after 24 hours, but
for some reason some mail does not. Any thoughts ?

Ron