OK, it would appear that there has been at least one case where I did not receive a contest submission and no email was bounced back to the sender. This would appear to be the result of an oversized attachment (my mailbox only allows up to 32mb for a single email, but due to encoding it's possible that files around ~25mb in size might be rejected).

So, please ensure that you have received a personal email from me informing you that your entry was received. If you did not receive such an email please contact me right away.