If you send an email it was either delivered or it wasn't. So, how can it be in Sent file as well as in Inbox as "Mailer Daemon "Mail delivery failed".
Thanks Tweenkee,
I'm trying to copy paste something here but it won't allow it.
Anyway like I asked Shavkat above why is it under sent it was an attempted sent but since it was not recieved, how can it be in the same file as the ones that were successfully delivered, received by the sentee? When you look at the sent file there is no distiction between the received mail and the mailer demon ones.