North American Network Operators Group
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Re: OT? /dev/null 5.1.1 email

  • From: Valdis.Kletnieks
  • Date: Wed Jul 06 00:13:59 2005 
On Tue, 05 Jul 2005 22:47:48 EDT, Patrick Muldoon said:
> What about setting your highest order MX and lowest order MX to point to
> the same set of mail servers, and hide your backup servers in the
> middle.

Devious. ;)

>         Even better if you can implement something that auto blacklists
> people that connect to your "secondary" MX's when you know that your
> primaries are up and accepting e-mail.

The problem there (especially if the primary and secondary aren't on the same
subnet/network) is that just because *you* know that your primary is up and
receiving, that doesn't mean that a network glitch didn't render it inaccessible
from the sending site.  I'd hate to get blacklisted just because our main link
to the outside world hiccupped, and it happened to come up in time for us to
fall back to the secondary MX that you *TOLD* us to use. ;)

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