smtproutes

[Steve Woolley]

I am planning to use smtproutes to route email from a qmail server
to an internal Microsoft Exchange 5.5 server. 
If the Exchange server goes down for a period of time, will the
qmail server cache (for lack of a better word) the routed emails
locally until the Exchange server comes back up? or will the
qmail server bounce the email back (after a given amount of time)?

Steve Woolley
[EMAIL PROTECTED]