[Mimedefang] MD errors: 451 4.3.2 Please try again later

[Greg McCarthy]

Over the last few days I've been trying to get md/clamav up and
running. After reading a good few howto's I thought I had everything
up and running properly. However when I do a manual telnet 127.0.0.1
25 I get the above error.

>From what I've read it looks like a generic error. I've checked over
all my settings and must be missing something simple.

I'm my sendmail config file I've added:
INPUT_MAIL_FILTER(`mimedefang',
        `S=unix:/var/spool/MIMEDefang/mimedefang-multiplexor.sock,
F=T, T=S:5m;R:5m')

I have the following processes running:

19931 ?        S      0:00 /usr/local/bin/mimedefang-multiplexor -p
/var/spool/MIMEDefang/mimedefang-multiplexor.pid -z /var/spoo
19943 ?        S      0:00 /usr/local/bin/mimedefang -P
/var/spool/MIMEDefang/mimedefang.pid -m
/var/spool/MIMEDefang/mimedefang-
19944 ?        S      0:00 /usr/bin/perl /usr/local/bin/mimedefang.pl -server
19945 ?        S      0:00 /usr/local/bin/mimedefang -P
/var/spool/MIMEDefang/mimedefang.pid -m
/var/spool/MIMEDefang/mimedefang-
19946 ?        S      0:00 /usr/local/bin/mimedefang -P
/var/spool/MIMEDefang/mimedefang.pid -m
/var/spool/MIMEDefang/mimedefang-
19948 ?        S      0:00 /usr/bin/perl /usr/local/bin/mimedefang.pl -server
19999 ?        Ss     0:00 sendmail: accepting connections
20002 ?        Ss     0:00 sendmail: Queue runner at 00:05:00 for
/var/spool/clientmqueue

Can anyone shed some light on this?

Thanks