Does anyone know how to defend against forged email headers.
For example a user has a website called sampledomain.com and there is one email address setup
info@sampledomain.com
What happens is the server gets emails from
GeorgeMiller@sampledomain.com (obvious spamming of faked email headers) and the email has Spam content also.
Occasionally these emails are failure emails and often there are hundreds of failures.
Is this an exploit of a weak server (i.e. would moving to a dedicated / managed server solve this sort of problem ?)
Its a puzzling one, since you cannot find out where the emails are coming from, they seem to be relayed.
Any assistance would be great !