[DavyMac]

This is very odd behaviour indeed. Of the 148 orders that were checked to see if a reminder should be emailed to the customer their status was as follows:
8 Awaiting Payment
12 Not Finished
8 Failed
1 Cancelled
60 Dispatched
59 Payment Authorised.

Except for 1 Not Finished and 1 payment Authorised ALL orders were sent an email.