DKIM integrity after smtp-proxy

edited February 21 in Firebox - Proxies

We filter incoming e-mail with a firebox with a smtp-proxy rule. Then e-mail is forwarded to another maliserver/SMTP filter (we have different software in different installations).
All messages containing DKIM signature processed by smtp-proxy fail DKIM integrity check on our mailserver/mailfilter.
If we disable smtp-proxy and leave only a normal port 25 mapping, DKIM integrity check is preserved.
Is there some setting we can disable in smtp-proxy to preserve DKIM integrity?

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