Relaying for legitimate downed hosts

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Author: Pete Ashdown
Date:  
To: Exim Mailing List
Subject: Relaying for legitimate downed hosts
Part of the problem I have with blocking all relaying is that our mail
server acts in a legitimate function as a relay for hosts that are
unreachable at the moment. Any ideas how to prevent one kind of relaying
(ie: for spam) and allow another?