At 12:34 PM 7/27/2012, Russell Coker wrote:
On Fri, 27 Jul 2012, Tony Langdon <vk3jed@gmail.com> wrote:
wondering). However, you can't point an MX record to a CNAME, only an A (and/or AAAA for IPv6 capable MXs).
http://doc.coker.com.au/papers/benchmarking-mail-relays-and-forwarders/
Unfortunately you can do that and it seems to work. It probably fails in corner cases and causes extra DNS work which is a bad thing. My above paper on benchmarking DNS and mail servers is relevant. While CPU performance has increased a lot since 2006 the general principle still applies. Although admittedly systems which don't use SSD and a filesystem like ZFS are probably more likely to hit storage bottlenecks now than they were 6 years ago.
Well, you're not _supposed_ to be able to do it, to stick to the RFCs, at least last time I had a read. :) 73 de VK3JED / VK3IRL http://vkradio.com