Block outgoing mail as spam

My few clients emails got blocked by PMG as follow rules

Spam detection results: 3
AWL -3.461 Adjusted score from AWL reputation of From: address
BAYES_00 -1.9 Bayes spam probability is 0 to 1%
DEAR_SOMETHING 1.973 Contains 'Dear (something)'
DKIM_INVALID 0.1 DKIM or DK signature exists, but is not valid
DKIM_SIGNED 0.1 Message has a DKIM or DK signature, not necessarily valid
DMARC_REJECT 0.1 DMARC reject...

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