I have managed to get it working. This is what I did.
1) Install fresh mercury32 on a new dir.
2) Manually copy the usermail folders.
3) Config the spamhaus filter to query zen.dnsbl -> still not working.
4) Change local networking setting to add 127.0.0.1 dns enry. Restart mercury -> WORKING!
5) Try running the previous installation of mercury32 with same spamhaus filter settings -> not working - duh!
6) Change back to new mer32 installation. Working but mystery not totally solved.
<P>I have managed to get it working. This is what I did.</P>
<P>1) Install fresh mercury32 on a new dir.</P>
<P>2) Manually copy the usermail folders.</P>
<P>3) Config the spamhaus filter to query zen.dnsbl -&gt; still not working.</P>
<P>4) Change local networking setting to add 127.0.0.1 dns enry. Restart mercury -&gt; WORKING!</P>
<P>5) Try running the previous installation of mercury32 with same spamhaus filter settings -&gt; not working - duh!</P>
<P>6) Change back to new mer32 installation. Working but mystery not totally solved.</P>