That appears to be one single email with limited context. The README.md in that repo outright states that the context for the email is absent and does not necessarily provide concrete proof of any specific narrative:
> ... Remember that while the email is validated, the context isn't. It's possible this reflects a secret meeting to conspire with Vice President Biden. Or, it's possible the guy attended one of the many Washington D.C. social functions whereby people shake hands with politicians and exchange pleasantries. As Richelieu is claimed to have said "Give me six words by the most honest of men and I'll find something to hang him by". Give me an email dump from the most honest of persons, and I'll pull one out of context to hang them in the court of social media. ...
> ... I personally have many doubts about where this email came from, and the overall "narrative" they are trying to push. Regardless, I can validate the basic facts about this email.
It's not a very new development, but most or all mention of it was removed on many platforms including on HN: https://news.ycombinator.com/item?id=24942678