North American Network Operators Group|
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Re: Spam filtering bcps [was Re: Open Letter to D-Link about their NTP vandalism]
Steve Thomas wrote:
Earlier today, I said:This policy I whole heartedly agree with, and I strive where ever possible to enforce this in every place I work, where ever people get listed in SORBS for backscatter, I work with them telling them how they can do this....
With the current technologies available there is no reason a small-medium organisation cannot virus and spam scan mail inline at the SMTP transaction stage. (Even the barracuda's can spamassassin scan at around 8 messages per second - my previous employment were receiving around 4 messages per second - which translated to 1-2 million emails per day)
It is possible to do inline scanning in larger ISPs (I personally have configured a 'system' to handle upto 90 message per second inline scanning) - though it requires a lot more planning, thought, and careful consideration.