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All messages being tagged NO_DNS_FOR_FROM on Zimbra server

On our Zimbra 6.0.5 server running on Fedora 6, it seems that all messages are being tagged by spamassassin with NO_DNS_FOR_FROM (despite having legitimate sent addresses). How should I debug this? ...
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2answers
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Zimbra installation not working

Symptoms : our mail server, a dedicated Fedora server with zimbra, stopped working, in such a way we couldn't even log in with SSH. Soft reboots, through our web admin console, did make it work again, ...