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.

Is there any way round this?

I want the fall back to be activated in cases where the DNS literally
fails, not the subsequent connection.

Thanks in advance,

Nigel

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