From: Axel Strübing (axel.struebingle-tex.de)
Date: Thu Feb 07 2008 - 10:13:05 CST

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Dear all,

I am sorry for the late reply, but business as usual ...
I am also sorry for not telling you the real truth.

The point is, that we are going to use host2 for imap and will backup it in
our regular backup cycle.

Host1 should become our main mail exchanger for the outside world (first
mx-record in DNS) but nobody will read mail there. We will shut down imap
there. It will merely store every mail for some days and a maintenance script
will purge older messages.
At the same time host1 should send every incoming message to host2.
There imap and backup take place. This setup was chosen because host1 has a
faster internet connection and is located at an external location/hoster.

Backup in the original mail was more with the meaning of better redundancy,
bandwidth etc that is provided externally. Nobody of the outside world shall
know, if host2 is down for maintenance or more catastrophic reasons.

Once again I am sorry for not making clear my intention at first.

kind regards
Axel

Am Montag, 4. Februar 2008 16:04:18 schrieb Victor Duchovni:
> On Sun, Feb 03, 2008 at 10:56:12PM +0100, Axel Str?bing wrote:
> > Dear all,
> >
> > our setup consists of our primary MX( let's call it host1) and a second
> > host (host2) that should get a copy of every message, entering at host1.
> >
> > We want to do this for backup reasons and allowing our users to use host2
> > for imap so releasing some load from our internet connection and host1.
>
> Email archiving and IMAP back are not compatible, because users expect
> more from a backup IMAP store than mere duplication of incoming email.
>
> - Message flags need to replicated (unread, ...)
> - Message folders need to be replicated
> - Deletion of mail needs to be replicated
> ...
>
> So you need to replicate the IMAP store, not the incoming mail stream.
> Archiving all email is a separate problem. Which one are you really
> solving?

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