I would think it would be either "intentionally" or "knowingly." In other words if you sent the email intending to contact the other person that's pretty clear

I would think it would be either "intentionally" or "knowingly." In other words if you sent the email intending to contact the other person that's pretty clearly there. I would suspect at least some states would draw the line at "knew or should have known" when you hit send. But "couldn't reasonably have known" is different. If Google is, for example, looking at your past email contacts and sending invites out on your behalf then that is so far beyond "knew or should have known" that I can't imagine it applying.