I have noticed a lot of firstname.lastname@example.org NDR emails in our exchange 2003 SP2 Queue.
These emails all our from different .biz domains(Is .biz real?) I delete these emails from the Queue and select without NDR and they come back. WE have a spam filter outsourced that stops spam from entering our domain at least most of it.
Is this spam? a internal virus on a pc sending these out ? How are these emails generated internal or external?
Can't sem to permantly stop them
Here is an example
from the Queue i open the email and the from has
the recipient is