Load balancing email?

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On Tue, 2005-10-25 at 17:17 -0500, Nathaniel Hall wrote:
> Benjamin Smith wrote:
> 
> >Currently, we have two mail relays for inbound messages, and a third for POP. 
> >
> >The inbound messages go thru all the CPU-intensive anti-spam stuff, and then 
> >they relay it to the POP server for pickup. 
> >
> >Currently, one of these is the "primary", and the other is "secondary", and 
> >I'd like them to be considered more or less as equals, since the "primary" 
> >system is getting beaten pretty hard. 
> >
> >The DNS zone file says something like this: 
> >
> >###############################
> >@isp.com 
> ><SNIP>
> >                IN      MX      100 mx1.isp.com. 
> >                IN      MX      1100 mx2.isp.com.
> ><SNIP 
> >################################
> >
> >I seem to recall that I make them act as "equals" by simply changing this to 
> >
> >###############################
> >@isp.com 
> ><SNIP>
> >                IN      MX      100 mx1.isp.com. 
> >                IN      MX      100 mx2.isp.com.
> ><SNIP 
> >################################
> >
> >so that they both get about the same amount of inbound messages. Has anybody 
> >here actually done this? How well does this work as far as failover if either 
> >system fails? 
> >
> >-Ben 
> >  
> >
> I actually recommend using a Cyrus system.  We are able to handle about
> 20,000 accounts with the following servers:
> 
> 3 front ends (Horde, IMAP, Spam Assassin, SMTP, etc load-balanced at the
> firewall)
> 2 storage servers (actually stores the e-mails)
> 1 MySQL server (Used for Horde)
> 1 list server (for MailMan)
> 
> This can easily be added to.  We use it a lot so that we can remove a
> system from the load balance and upgrade one server at a time.  We can
> eventually take all but one out and have them upgraded and then swap the
> last one with all of the new servers.  It appears to be seamless to the
> users and sure helps with being able to do maintenance at any time of
> day and you don't have to have overly powerful servers to get it working
> well.
----
Let me see if I get this straight - OP asks about multiple MTA & dns/MX
records and your answer is about MUA's and delivery agents. Good thing
at least we all speak English. 

OP - your logic is good - should work. I hesitated to answer since I
have no first hand experience with multiple MX records of same value for
priority.

Craig


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