Colbeck, Andrew wrote:
Thanks, everyone.
I was hoping for more war stories, or specific gotchas with more ornate
configurations, so I'm suprised at the few responses. For example, I've
noted that IMail has a queuing problem with HotMail advertising MX servers
that don't actually accept mail, or that don't exist, which could come about
with normal "downtime" on a mailhost that is still advertised in DNS.
The Hotmail issue is really an IMail issue where they poorly implemented 'DNS caching' and 'failed domain skipping'. When you turn these off, the Hotmail issue reportedly goes away, and I'm not aware of any advantages to using them considering that Declude does about 100 times the DNS lookups on my system without issue and without caching. I'm not convinced that load balancing with multiple A records would resolve anything with this configuration either, so it is of no consequence either way as far as I can tell. Hopefully others that might implement some form of DNS caching with failed domain skipping would see fit so as to not cache records that fail.
Your setup is just simply a matter of how much of your E-mail you would like to go to a particular IP, and if you wished to make use of extra weight for messages that bypass a higher priority for no good reason. I doubt that anyone here has had any issues with either running stepped priorities or a single priority with round robin load balancing.
Matt
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