I’d call it waylaid momentarily, not the end of the world 
PS: The Apple Mail plugin is not required nor the only option available. See DEVONthink’s Help > Tutorial > Handling Email.
Is there a reason why the DT log popped-up advising me to strongly uninstall the “AdobePDFViewer.plugin” from Internet Plugins folder…
Of course there’s a reason 
It has long been known to be crashy and it’s not required in a browser. It hasn’t been for a long time as browsers already provide a PDF plugin. And yes, it was able to crash DEVONthink as well.
