Fail-over is not done with a qmail patch ;)
You should look into heartbeat and other high availability solutions.

>   In-house we've set up a server to act as a secondary MX record to the
> domains we host mail.  The server then forwards these messages to the
> actual mail server the domain is hosted.  The goal is that, in the event
> a server dies, mail is still collected and gathered, waiting to be
> delivered to the proper server.  The setup of qmail follows the toaster
> guide.
>
>   Because the actual mail servers are working fine - the server is
> getting nothing but spam and junk emails, filling the queue is growing
> to huge sizes over 117K in messages!  Spamassassin is barely able to
> keep up with the load, and I'm sure clamav isn't far behind.  We've been
> pruning the queue of messages using qmHandle, but we need something that
> handles things on its own.  We've also set the queue lifetime to be 12
> hours.
>
>   Some ideas we've been comtemplation to fix the issue:
> - another failover server set up the same way that handles 1/2 the
> domains secondary MX records.
> - some qmail patch that reject the mail if the actual server is still
> online and operational
> - keep failover server offline until needed
>
> Any suggestions on this are appreciated.  Thanks.
>
> James G
> Sr.  Systems Administrator
> Cavecreek Systems Administration Team
> http://www.cavecreek.net <http://www.cavecreek.net/>
>
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