* Chris <kingpinofdi...@yahoo.com>:
> I am running postfix as a SMTP front-end to my Exchange 2007 system.
> 
> When Exchange goes down, email is bounced back to the sender as undeliverable.

Why? Show some logs for such a case

> How can I setup postfix to 'spool' email until the backend SMTP server is 
> online?

That's the default :)

> I have enclosed my main.cf, master.cf, and transport configs (at least the 
> non-default ones).  

postconf -n is very much preferred.
The config looks OK so far

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | http://www.charite.de
            

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