I've been wondering about this... It definitely doesn't feel great to be on the receiving end of something auto-generated. But a "unique" message is at least more interesting to read, and doesn't feel quite as frustrating.
A yet if P(someone unknown is a robot) gets too large, it's going to be a weird adjustment period.
Better one would be "based on these three columns, generate a cold outbound email for the person..."
it would suck to be on the receiving end of those, but the use case makes much more sense.