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List:       exim-users
Subject:    Re: [exim] Mail Routing with Exim and Queue management
From:       Tony Finch <dot () dotat ! at>
Date:       2004-12-30 23:09:39
Message-ID: Pine.LNX.4.60.0412302307370.30485 () hermes-1 ! csi ! cam ! ac ! uk
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On Thu, 30 Dec 2004, Erik Zweers wrote:
> 
> I currently having one big issue.  The problem is that we have a
> mailstore that has been undergoing a severe ammount of load and has
> rejected mail for a couple of minutes.  This has turned into a fairly
> vicious cycle because over that couple of minutes the mailstores have
> queued up mail for this server, which they tend to dequeue all at once.
> We've switched from sendmail to Exim for the mailrouters (almost
> complete) and one difference seems to be that Exim will dequeue all the
> mail pending when it decides to dequeue, while sendmail will dequeue it
> gradually over the queue window.

If you want the sendmail behaviour you could try setting
connection_max_messages = 1 on the smtp transport that delivers
to your message store machines.

> Just some notes about future plans I am considering.  I'm thinking about
> having exim deliver the mail directly to cyrus imap via lmtp on the
> remote servers.  I don't suppose anyone has done anything like this?

We're doing this, and it works fine. It will probably reduce the load
caused by delivering messages on your message store machines.

Tony.
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