I wish I could give more specifics, but since our update to SM 14.2.5704 we're seeing at least a 4x increase in inbound DKIM spam filter failures.  We've had to reduce the weight on DKIM to lower the false positive rates.  Many of the messages are from Microsoft (outlook, hotmail, and the thousands or millions of Microsoft hosted domains).  

 

Anyone else seeing this behavior?

 

Thanks,

-Joe