[Mimedefang] no filtering happening , no errors to be seen - how to troubleshoot?

[Kitione Lalakomacoi]

I've setup mimedefang to make a spam filtering gateway on FreeBSD 4.7,
sendmail version 8.13.6.20060614 compiled with:DNSMAP LOG MAP_REGEX
MATCHGECOS MILTER MIME7TO8 MIME8TO7 NAMED_BIND NETINET NETINET6
NETUNIX NEWDB NIS PIPELINING SASLv2 SCANF STARTTLS TCPWRAPPERS USERDB
XDEBUG

the install runs without any trouble and the mimedefang and
mimedefang-multiplexor processes start up with no issues.

the milter is called in the .mc file as per the manual
INPUT_MAIL_FILTER(`mimedefang',
`S=unix:/var/spool/MIMEDefang/mimedefang.sock, F=T,
T=S:60s;R:60s;E:5m')dnl
(note F=T, this thing should be stopping all deliveries if the milter
doesn't work, however its quite happy to deliver away)

/var/log/maillog tells me as the multiplexor and slaves start up:
Jun 26 04:02:46 emeks sm-mta[75279]: starting daemon
(8.13.6.20060614): SMTP+queueing at 00:30:00
Jun 26 04:02:46 emeks sm-msp-queue[75283]: starting daemon
(8.13.6.20060614): queueing at 00:30:00
Jun 26 04:05:26 emeks mimedefang-multiplexor[73292]: Received SIGTERM:
Stopping slaves and terminating
Jun 26 04:05:26 emeks mimedefang-multiplexor[73292]: Slave 1 resource
usage: req=0, scans=0, user=0.950, sys=0.253, nswap=0, majflt=2,
minflt=8316, maxrss=25780, bi=0, bo=0
Jun 26 04:05:26 emeks mimedefang-multiplexor[73292]: Slave 0 resource
usage: req=0, scans=0, user=0.958, sys=0.241, nswap=0, majflt=9,
minflt=8319, maxrss=25836, bi=725, bo=0
Jun 26 04:05:30 emeks mimedefang[73307]: MIMEDefang-2.57: mi_stop=1
Jun 26 04:06:02 emeks mimedefang-multiplexor[75917]: started;
minSlaves=2, maxSlaves=10, maxRequests=500, maxIdleTime=300,
busyTimeout=600, clientTimeout=10
Jun 26 04:06:02 emeks mimedefang-multiplexor[75917]: Starting slave 0
(pid 75923) (1 running): Bringing slaves up to minSlaves (2)
Jun 26 04:06:02 emeks mimedefang[75932]: MIMEDefang alive.
slavesReservedForLoopback=-1 AllowNewConnectionsToQueue=0
doRelayCheck=0 doHeloCheck=0 doSenderCheck=0 doRecipientCheck=0
Jun 26 04:06:02 emeks mimedefang[75932]: Multiplexor alive - entering main loop
Jun 26 04:06:05 emeks mimedefang-multiplexor[75917]: Starting slave 1
(pid 75939) (2 running): Bringing slaves up to minSlaves (2)
Jun 26 04:06:11 emeks sm-mta[75953]: starting daemon
(8.13.6.20060614): SMTP+queueing at 00:30:00

however nothing actually happens.  No filtering of any sort - i've
added a dummy action_add_header call in filter_end() applied to all
e-mails going through, but it never actually adds any headers.

running md-mx-ctrl msgs tells me that no messages have passed through
the filter, even though i've sent multiple e-mails through.

basically there are no error messages at all.  My question then is,
where should i start my troubleshooting? where do i start hunting for
problems?

any assistance would be appreciated.

Regards,


Kiti