What's the current industry best practice to prevent backscatter for emails that have been accepted by your mailserver?
My mailserver rejects the vast majority of spam before the message is sent by the sender thereby hugely reducing the backscatter I could generate. I do this using a combination of SPF, DNSRBL's, reverse lookups, only accepting mail for valid recipients and blacklisting certain domains. We also have Directory harvest attack protection.
But what about those Virus infected emails that get through the first line of defence and only get picked up by the mail relay's antivirus software?
There is no point quarantining it and emailing the user a warning - it will waste both the users and most likely the IT dept's time. The only option left is to bounce the message with an NDR/DSN.
We cannot both refuse to send a message to a users and mailbox and not send an NDR/DSN. That would make our mail system both non RFC compliant and create a potential email black hole.


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