On Sat, Nov 24, 2018 at 06:52:00PM +0000, Craig Skinner wrote:
> Hi Peter,
> 
> On Sat, 24 Nov 2018 08:21:46 +0100 "Peter J. Philipp" wrote:
> 
> > ... the MX priority was all the same in DNS ...
> 
> This is a vastly different scenario to Mik's question. Not the same...
> 
> 
> > .... backup MX's too I think with a higher priority field in DNS,
> > ... all they did was queue the mail and wait for the main mail hosts
> > to come back from whatever caused them to be down, then they'd
> > deliver the mail there.??It was just a relayer.
> 
> Yes, that is what Mik was asking about;- The MX backup servers spool
> mail while the primary mail servers are down, then relay over SMTP when
> the primary can recieve the spooled mail.
> 
> 
> > ... A solution is to use dot-lock files ...
> 
> Maildirs solve the hideous problems of mboxes... whether on NFS or not.

This is good advice.  I'm gonna try this in the future.  I read about this on
wikipedia and it seems to me every message is in its own file.  Would it be
easy to unison (2 way rsync) mail that's in the new folder to a backup and
thus keep them synced for failover?

Happy Sunday!
-peter

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