Apart from the whole I don't think that word means what you think it does thing, the issue with this is that the output seems to be equivalent to what you would

Apart from the whole I don't think that word means what you think it does thing, the issue with this is that the output seems to be equivalent to what you would expect an American marketer to produce and spam out after scraping linkedin. Presumably this is because there are a lot of examples of that style of email present in the training data. Personally if I received any of these I wouldn't even get past the first line before marking it as spam, which probably wouldn't do the reputation of your mail server much good. It's an interesting, if slightly evil, idea, but I'd want the style of the output to be different or customizable before actually using something like this. In other words it needs a "tone of voice" setting. Write intro to someone in voice of cynical Brit / enthusiastic Canadian / morose Finn etc.