OT: Backup MX

Green, Rodney rgreen at trayerproducts.com
Thu Sep 14 18:09:36 IST 2006

Glenn Steen wrote:
> On 13/09/06, Dennis Willson <taz at taz-mania.com> wrote:
>> Actually running a backup MX is a good thing. You can multi-home the
>> backup MX (I refer to this as a mail hub), This hub is setup as a
>> lower priority MX, then it would be setup to forward all email for
>> your domain(s) to the real server via the second interface. The hub
>> should not have to know anything about users.
>> I have a setup where I have two hubs that forward to the end user mail
>> server. The end user mail server never directly receives email from
>> the internet. All Spam filtering is done out at the hubs so the server
>> the users deal with has all its CPU power to handle users requests and
>> they see good response times from the server regardless of how much
>> load the hubs are under due to Spam scanning/filtering.
>> While a lot of people know this.... remember the DSL line will need a
>> static IP address.
> Just adding a tad to Dennis advice:
> The hubs need be equal in one thing: Setup to fight spam etc. Meaning
> that the relays will need know enough about the users (if running PF,
> just hypothetically:-) to know which mails to accept for relay and
> which not to accept. If one does as Dennis, and have hubs that are
> equal in all sense except priority (and connectivity), one should be
> able to cope by mirroring/rsyncing selected config directories... and
> having bayes (and whatnot:) in sql.

Cool. Thanks for the advice guys. Now to come up with a diagram on how 
it's all going to work. :-)

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