[Mimedefang] Filter did not create RESULTS file

[John Smith]

Hi,all
  
I run MIMEDefang nearly one month, sometimes meet following problem.
But when I restart the mimedefang, all is ok.

May 23 06:25:01 mailserver sendmail[8001]: h4MMOrmp008001: from=<mlist at return.cn
99.com>, size=213456, class=-60, nrcpts=1, msgid=<3ECD3CA0.000003.26529 at bjapp3>,
 bodytype=8BITMIME, proto=ESMTP, daemon=MTA, relay=ns1.toyako.co.jp [202.219.
127.1]
May 23 06:25:02 mailserver mimedefang[238]: h4MMOrmp008001: Filter did not creat
e RESULTS file
May 23 06:25:02 mailserver sendmail[8001]: h4MMOrmp008001: Milter: data, reject=
451 4.7.1 Please try again later

How should I solve ? Thanks  

--------------------------------------------------------------
My system is:

Solaris 5.7
Perl-5.8.0
Mimedefang V2.31
sendmail 8.12.9


Best Regards,

                                            MonkeySun