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 -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.