Blocking certain attachments?

I’ve started to have a few spam emails show up with virus-infected .ace attachments. I never use .ace files, so any that show up must be spam. Is there any way to simply discard any messages with .ace attachments?

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I googled how to do this with postfix and found this article:

I have no idea if it will survive an update to MIAB. But it will do the job for now.

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I have a rule for sorting receipts that includes the following:

header :mime :anychild :contenttype "Content-Type" "application/pdf"

You should be able to find the mime type be looking at the source for one of your spam messages.

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