I was wondering if it is possible to filter incoming mail by searching for the attachment of an internal certificate. I am considering setting a rule which collates all e-mail from users that have created mail with a certificate to direct this into a new folder. This will only apply to internal e-mail across our organisation therefore I will know the names of those users that I am expecting to use certificates. any one else using certificates for whatever reason will not be filtered into this new folder.
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