Backup mail server?

[Andy Green]

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Matthew Miller wrote:
| On Tue, May 17, 2005 at 08:43:58AM +0100, Paul Howarth wrote:
|
|>I think that what he meant was not outbound SMTP, but that if a sole MX
|>goes down for more than a few hours, anyone trying to send mail to the
|>domain(s) served by this server would get "Warning: Message Delayed"
|>type messages from their own SMTP relays, and it was this that he wanted
|>to avoid, as it might lead his own clients (people, not MUAs) to think
|>that his service was unreliable when they discovered this.
|
|
| In which case a second mail server with a lower MX priority is a great
| solution, given the caveat that it needs to be decently maintained and so
| on.

I agree with the "don't bother with backup server" idea, but maybe
something that would make everyone happy is the MX TTL set to a couple
of minutes, and a backup server that is only placed into the DNS record
as the MX, *and only accepts incoming port 25* when the primary is down.
~ When the primary is back up again the backup machine is removed from
the DNS record and rejects incoming port 25.

- -Andy
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