I guess I was not clear. I do not use AT&T (for anything) but we have seen the load increase so much on our own name servers that we are adding more.
How many E-mails do you send/receive per day? How many spam databases do you query for each E-mail?
At 100,000 E-mails/day and 20 DNS queries per E-mail, that's 2,000,000 DNS queries a day -- which sounds like a lot, but that's only 23 per second, less than 1% of the load that some DNS servers handle.
We have a DNS server here that often handles 20+ queries per second, and the CPU load is negligible.
I only use AT&T as a reference point - they must have decided the load was too much to take such drastic action.
Correct -- at 1,000 business customers with those 100,000 E-mails/day and 20 DNS queries each, you're talking 2 billion lookups a day, which starts to add up.
-Scott
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