> -----Original Message-----
> From: Tom Collins [mailto:[EMAIL PROTECTED]
> Sent: Thursday, 8 September 2005 12:46 AM
> To: toaster@shupp.org
> Subject: Re: [toaster] Query about backup-mx's
>
>
> On Sep 7, 2005, at 8:01 AM, David wrote:
> > My question is: if mail.backup.dom receives e-mail intended test.com,
> > how
> > does it decide that the mail should go to mail.master.dom? ie. does
> > the DNS
> > data override all /control/locals entries (_and_
> > /control/virtualdomains)?
> > or, will it be the case that even if mail.backup.dom is _not_ primary
> > mx for
> > test.com (as in my little example above), will it still check
> > /control/rcpthosts and/or /control/virtualdomains and, if an entry is
> > found
> > in there for test.com, deliver it locally?
> >
> > What I am trying to investigate is the possibility of true backup
> > mailserver
> > takover; ie. something better than silently queing my mail on a backup
> > mx
> > when the primary is offline. But if the DNS data overrides
> > /control/rcpthosts and /control/virtualdomains, then my quest is
> > pointless... I'll never be able to make a simple configuration change
> > on the
> > fly and have my backup mx become my primary mx without modifying my DNS
> > (which I want to avoid at all costs, as it takes so long for the
> > changes to
> > take effect as to be pointless).
>
> If the domain is only in rcpthosts, then your backup will queue it and
> continue trying to deliver to the primary server.
>
> If you have it in virtualdomains, then qmail should deliver it locally
> to that machine. Of course, you need to figure out how to keep mail
> and configuration information synchronized between the servers if you
> go that route.
Thanks guys for the info.
I guess that more specifically I have now narrowed my problem of failover
accross an Internetwork link down to the pop3 server! Of all things... the
effect of which, I imagine in production, would be something like: master mx
goes down, that's fine; all mail is delivered to backup mx (locally), which
has shared storage/rsync/etc. with master so it has all the mail on it. User
goes to check mail ("send/receive") and receives an error that the pop3
server cannot be found: there's no way to failover the address of the pop3
server (because that is entered in the MUA's mail settings).
So I suppose that SMTP failover is more or less possible, now I'm stuck on
the pop3 failover!
Thanks again,
David.
> -Tom
>
>
> !DSPAM:431f0433129511828715420!
>
>
