What's an OPEN RELAY?
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What's an OPEN RELAY?
In pretty simple terms an "open relay" is a server that allows unrestricted forwarding (relaying) of e-mail. These are targetted by spammers to send their stuff so that it is not easily traced to them, and that the victim machine gets all the rejection messages for "dead" addresses. They are also not paying for the bandwidth.
It basically means that the server has very poor security to be exploited that way, but there seem to be plenty of them around :(
Cheers