From: Brendan Grossman (brendangrossman.id.au)
Date: Wed Mar 01 2006 - 03:53:17 CST

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Hello

I've been told (not sure with postfix) that backup MXs can be configured to
hold mail indefinitely or for a certain time period.

Is this possible with postfix? The only option I've seen to configure a
backup MX is with 'relay_domains domain.com' set on the backup MX of
domain.com - which, I assume, instead of the sender's mail server attempting
to redeliver, the backup MX will.

As a matter of fact I'm not quite clear on how backup MXs work. If the above
is correct, and the primary MX doesn't come back in x number of hours, will
mail be bounced? And if so, will the sender's mail server attempt to
redeliver or just return it to the sender?

Thanks

Brendan

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