You could do this with postfix. Setup the "MAIN" server as a postfix mail gateway, and use your local server as the imap server. The messages will arrive at the "MAIN" server that your MX record points to (where they could be spam/virus filtered) and then would be immediately passed to the local network server (where users could access them via pop/imap). I don't know if this is what you are looking for as users would need access to the local network to even read their mail, and you would only have one persistent copy of the hosted mail (instead of the office being a secondary backup), but it would help to increase speed.

--Kirk

Claudinei Matos said the following:
Yeah, I saw that the problem is ocurring 'cause all the users share
the same ip which one is the ip of the internet gateway.
Anyway, with the new limit of connections everybody can retrieve mail
but some users are annoying me about the speed to access the server.
What I want is that the messages that arrive at my MAIN (the one at
the hoster)  server could be redirected to my proxy/backup server (the
one at my local network) or if it could be, that the proxy/backup
connect to the main server to catch all the accounts messages.
I know I culd just use my local server as my MAIN MX but the problem
is that this server is connected to internet by a adsl not confiable
and with dynamic ip link. So I was thinking if I could setup this
local server as my primary MX with his dyndns hostname and put the
"old main" server as the backup MX, just in the case adsl link get
down.
I've also got a quick look at
http://www.courier-mta.org/imap/?README.proxy.html and I saw that I
can setup a proxy server to my users, but I don't know if that could
be a solution too.

Any advices would be appreciated.

Tks,

Claudinei Matos

On 5/16/05, Jonathan Nichols <[EMAIL PROTECTED]> wrote:

Claudinei Matos wrote:

I was looking at this parameter when I got your mail. Actually it was
specified a limit of 4 connections. I tried to setup to 0 ( I mean it
could be no limit) but doesn't work, so for a test I did setup it to
30 connections and did some tests, and I saw that each folder that I
try to open in thunderbird open a new connection at the server. So if
I have 10 users trying to see his email and 5 of they try to open 2
folders at the same time I will have 20 connections on the server. Is
that correct?

Pretty much, yeah. but, it's per IP. I have mine set to 180 and haven't had any problems at all. :)

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