It seems that "/etc/MailScanner/filename.rules.conf" needs a allow-rule, which allows those attachment names.
Is
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allow \.doc.pdf$ - -
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allow \.doc.pdf$ - -
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# Allow days of the week and months,xml, Excel- and Word-extensions in document names, e.g. blah.wed.doc or e.g. blah.xml.pdf
allow \.(xml|xls|xlsx|doc|docx|mon|tue|wed|thu|fri|sat|sun)\.[a-z0-9]{3}$ - -