On 2 Jul 2002, Nigel C. Cox wrote:

> Hi all,
> Just a quick question really
>
> We have a setup involving an internal DNS that is used to route
> internal mail and postfix as a central relay hub. Postfix is configured
> to do a DNS Lookup and then use a fallback relay otherwise. The problem
> is with servers that are not available consistently. The fall back
> relay in these cases is activated very quickly and the fall back will
> never understand what to do with this mail.
> We want the fallback to work for all no internal e-mail and the selected
> choice is to do this by DNS. All external e-mail being appropriately
> relayed (to a virus scanner as it happens, out of my control.)
> But, if an Internal e-mail server is "timed out" or "no route" then the
> fall back is activated and we have a problem.
>

Fallback relay is not a routing mechanism. Fix your design to behave
predictably. The transport table is your friend.

-- 
	Viktor.
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