Backup mail server?

Steffen Kluge kluge at fujitsu.com.au
Fri May 20 01:51:54 UTC 2005


On Thu, 2005-05-19 at 19:57 +0800, John Summerfied wrote:
> If the final destination is down, the users aren't going to get their 
> email regardless of whether it's held on originators' servers or some 
> secondary MX between,

Depends on which part of the final destination goes down. Sites don't
always disappear altogether. If one MX fails, for example, having
another one next to it (*not* in between or in front of it) provides
perfect resilience.

> Still haven't established (to my mind) the need for backup mail exchanges.

That wasn't my intention. I was arguing against both backup servers and
HA for MTA's. I agree that there is no point in using intermediate
servers, and I believe there is no point running two MX'es in some sort
of load-balancing or fail-over configuration. Unless of course, the
machines also run the back-end stuff (pop, imap, webmail, Exchange,
Notes, etc), which is a very bad idea IMO.

Cheers
Steffen.


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