[Mimedefang] Milter read(mimedefang): timeout before data read

[Marco Berizzi]

Hello everybody. I'm using MD 2.6 + sendmail 8.12.2 (+ libmilter patch)
on Slackware 8.0

My Perl modules version are:

Digest-SHA1-2.01
IO-stringy-2.108
MailTools-1.15
MIME-Base64-2.12
MIME-tools-5.411a (+ patch for eml issue)

I'm using this script to start MD & sendmail:

# Start the MIMEDefang daemon:
if [ -x /usr/bin/mimedefang ]; then
  echo "Starting MIMEDefang daemon"
  if [ -x /var/run/MIMEDefang/mimedefang.sock ]; then
    rm /var/run/MIMEDefang/mdefang-mx.sock
    rm /var/run/MIMEDefang/mimedefang.sock
  fi
  /usr/bin/mimedefang-multiplexor -x 10 -m 2 -b 60 -i 300 -s
/var/run/MIMEDefang/mdefang-mx.sock
sleep 1
  /usr/bin/mimedefang -m /var/run/MIMEDefang/mdefang-mx.sock -p
/var/run/MIMEDefang/mimedefang.sock
sleep 1
fi

# Start the sendmail daemon:
if [ -x /usr/sbin/sendmail ]; then
  echo "Starting sendmail daemon:  /usr/sbin/sendmail -bd -q15m"
  /usr/sbin/sendmail -bd -q15m
fi

Iris (the linux box) is receiving one/two message every minute. Celeron
300MHz 64MB ram.
Syslogd sometimes logs this entry in /var/log/syslog:

Mar 18 06:03:58 iris sendmail[29090]: g2I51xQ6029090: Milter
(mimedefang): timeout before data read
Mar 18 06:03:58 iris mimedefang[29091]: Error from multiplexor: ERR
Filter timed out
Mar 18 06:22:05 iris mimedefang[29112]: Error from multiplexor: ERR
Filter timed out
Mar 18 06:22:05 iris sendmail[29111]: g2I5KcQ6029111: Milter
read(mimedefang): timeout before data read
Mar 18 08:00:33 iris sendmail[29181]: g2I6xKQ6029181: Milter
(mimedefang): timeout before data read
Mar 18 08:00:33 iris mimedefang[29182]: Error from multiplexor: ERR
Filter timed out
Mar 18 13:57:20 iris mimedefang[31787]: Error from multiplexor: ERR
Filter timed out
Mar 18 13:57:20 iris sendmail[31786]: g2ICtHQ6031786: Milter
read(mimedefang): timeout before data read
Mar 18 14:15:31 iris mimedefang[31924]: Error from multiplexor: ERR
Filter timed out
Mar 18 14:15:31 iris sendmail[31923]: g2IDDuQ6031923: Milter
read(mimedefang): timeout before data read

Attachment contain my /etc/mail/mimedefang-filter. Any idea how can I
resolve this issue?

PS: This machine forward all the mail for @aive.it to an internal M$
Exchange server 5.5sp3, also relay all the mail from the M$ Exchange to
the world.

linux.m4 contain:
INPUT_MAIL_FILTER(`mimedefang', `S=unix:/var/run/mimedefang.sock, F=T,
T=S:60s;R:60s;E:5m')