24 Feb
2005
24 Feb
'05
9 a.m.
Jeff Chan wrote:
On Wednesday, February 23, 2005, 8:03:54 AM, Frank Ellermann wrote:
...
Are DNS caches used by MTAs "better" than other DNS caches ?
Yes, because they see more mail on a single server and therefore should have higher cache hit rates.
Also, many spams are sent in a single message to many recipients. If check is done at mail server, only one query per URL will be done. At the same time, huge mail servers have a cache DNS running on the same machine - so faster queries.
Joe
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Jose Marcio MARTINS DA CRUZ Tel. :(33) 01.40.51.93.41
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