Not sure if anyone else has reported this but in SD.Email.Monitor workflow in SD 7.1 needs to be fixed/updated; as it is the "out of office autoreply" does not catch those emails; because it is using "Text equal" component and chances of this component catching any out of office message are zero to none...
So the fix is: open up "SD.Email.Monitor -> ProcessMessage model -> Check for Specific Emails", it is using "Text equal" component to check for "out of office autoreply" match; Instead it should be replaced with "Text Contain Rule" component (funny thing is, its label even says contain)
So there are two places in that embedded model which need to be updated; and using MultiTextContainRule component is probably better (which is what I ended up using)
I have attached a screen shot also.