Milter-greylist

> Now you can stuff breakpoints in each dkim related function and see 
> how it fills priv->priv_dkimstat

OK, dkimcheck_header was the first breakpoint to trip:

Breakpoint 7, dkimcheck_header (name=0x28865c80 "DKIM-Signature",
    value=0x28865c8f "v=1; a=rsa-sha256; c=relaxed/simple; 
d=domain.com;\n\ts=selector; 
t=1283742375;\n\tbh=+Pby8GPvv2IKr1c2RXTBWpjtkx1p0IqCseWIVKxoTt8=;\n\th=
Date:From:To:Subject:Message-ID:MIME-Version:Content-Type;\n\tb=DghH"...,
    priv=0x286ad400) at dkimcheck.c:151
151             if (priv->priv_dkim == NULL) {
(gdb) p priv->priv_dkimstat
$2 = 0

Despite looking at what clearly is a DKIM signature, $2 is 0. Stepping 
back a bit, the end of dkimcheck_error has:

      if (priv->priv_dkim != DKIM_STAT_OK) {
                (void)dkim_free(priv->priv_dkim);
                priv->priv_dkim = NULL;
        }

It looks like the pointer priv->priv_dkim is being compared to a 
constant (DKIM_STAT_OK). DKIM_STAT_OK is defined as zero, so I think we 
end up with a null pointer in this situation. Hence every time we get to 
line 151 priv_dkim is already NULL.

John