| mrkbkr on 1 Apr 2009 06:19:57 -0700 |
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Sending large amounts of mail puts a high load on your DNS servers. When your setting up a system like that its often a good idea to cache DNS look ups for a much longer time then a normal network would to cut down on the number of look ups & keep the load on the DNS servers at a more manageable level. Don't worry, they will catch up with you and the new mail server :) Mark On Apr 1, 2009 9:02am, sean finney <seanius@seanius.net> wrote: > hiya, > > > > On Wed, Apr 01, 2009 at 08:40:16AM -0400, Art Alexion wrote: > > > Real mail stopped going to the old server in about 48 hours, but spam still > > > goes there. Can anyone help explain how the DNS servers that spammers use > > > differ, and why this happens? > > > > spam servers (and infected zombies) are usually the least standards-complaint > > systems out there, so i wouldn't think about it too hard. maybe they have a > > poor implementation of DNS caching, or maybe it's intentionally designed that > > way. > > > > thankfully, such non-compliance is also what gave birth to greylisting > > and other effective anti-spam techniques :) > > > > > > sean > ___________________________________________________________________________ Philadelphia Linux Users Group -- http://www.phillylinux.org Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug
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