[Mimedefang] How to filter

[David Va]

Dear Experts,

I have just installed MD 2.37 with sendmail-8.12.8 on
RH 7.2. 

In the mimedefang-filter, I see the script filtering
file ext. like pif. Now my mail users still receive
NetSky worm with attachment *.pif. 

1. How can I filter the e-mail with the attachment and
drop it?

2. How can I know mimedefang does its job?

Thanks in advance for your kind solution.

David

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