Unfortunately, this is outside of the scope of what we can do with PerfectMail. Outlook may be performing additional spam filtering, that PerfectMail cannot control. You can read more about the Outlook Junk Email Filter at the following links:

Overview of the Junk Email Filter:
http://office.microsoft.com/en-ca/outlook-help/overview-of-the-junk-email-filter-HP010355048.aspx

Change the level of protection in the Junk Email Filter:
http://office.microsoft.com/en-ca/outlook-help/change-the-level-of-protection-in-the-junk-email-filter-HP010356454.aspx?CTT=5&origin=HP010355048

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