dbmail seems really a good idea to solve file system issue and common
backend issue.

Do you have a big installation running dbmail with Postfix in front ?

Are you still running the smtp from dbmail ? or only Postfix ? Is
there a patch for Postfix in that case ?

adulau

On Mon, 30 Sep 2002, dingomicrobsd.net wrote:

> While the url is useful to a degree the most simple way to build a
> cluster of MRAs is to use postfix and dbmail with mysql4. these three
> combined with anti-virus give you a true scalable redundent mail system
> for both pop/imap and the key to it all being the mysql database and
> replication. dbmail allows us to manage downtime and system failures in
> a more timely manner. and it is known to be scalable to tens of
> thousands of users, uses no accounts on the system, centralizes mail
> storage in the database and requires no /var/mail to hold users mail as
> the messages themselves are stored in the database.
>
> Clifton Royston wrote:
>
> >On Mon, Sep 30, 2002 at 02:48:08PM +0200, Marco Corte wrote:
> >
> >
> >>Domingo Antonio wrote:
> >>
> >>
> >>>helo all!
> >>>where can i find about postfix clusters?
> >>>i trying to create a cluster of postfixs..
> >>>
> >>>
> >>I found http://uni.x-si.org/hamail.txt very useful.
> >>
> >>
> >
> >This "punts" (i.e. says "we'll solve this later") on the most difficult
> >part of the problem, and in some sense the only difficult part of the
> >problem: namely sharing the user mail store which is dynamically
> >updated by POP/IMAP sessions.
> >
> >Creating a cluster of MTAs is easy. As someone else noted, that's what
> >MX records are for. A cluster of MRAs (mail retrieval agents) is the
> >hard problem.
> >
> >For this you need a working high-reliability NFS server, and you need a
> >reliable NFS client implementation in the OS on your mail servers.
> >(Note please that I am not talking about using NFS for queues, only for
> >the user mail store, be it maildir or what have you.)
> >
> >
> >
> >>>when 1 is down another do the job.. ( and all data in down server is copied to
> >>>the another.. )
> >>>
> >>>
> >>How can you do it? If a server crashed, how do you access the files on
> >>its disks? You need to share resources between hosts which is an OS issue...
> >>
> >>
> >
> >Yes, and you need to maintain the coherence of those resources while
> >they are being updated.
> > -- Clifton
> >
> >
> >
>
>
>
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>
>
>

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