Mailscanner file types problem

I need to allow .PDF.SGN files to come with attachment. Mailscanner is reporting that this file type is on the list of unacceptable attachments. I don't see it in filetype.rules.conf so I don't know why erased.

This is encrypted PDF file.
How can I make this file types to go through and not to be removed ? How this line needs to look like ?

thanks

 

 

 

 

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