Non-RFC compliant calendar files from unsolicited sender

type.inbound
and any(attachments,
        (
          .file_extension in $file_extensions_common_archives
          or .file_extension == "ics"
          or .content_type == "text/calendar"
        )
        and any(file.explode(.),
                (.file_extension == "ics" or .flavors.mime == "text/calendar")
                and any(.scan.ics.calendars,
                        any(.components,
                            .uid is null
                            and .type in (
                              'VEVENT',
                              'VJOURNAL',
                              'VFREEBUSY',
                              'VTODO'
                            )
                        )
                )
        )
)
and not profile.by_sender_email().any_messages_benign