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UTM - Blocking attached *.EML Files


We are having an issue where e-mails attached to e-mails as EML files are getting through to inboxes. This is bypassing block rules for file attachments.

Is there anyway to block e-mails with EML attachments? We attempted to use 'eml' as a blocked file extension, but presumably this will not work as all e-mails are of this extension.

Thanks in advance!

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